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https://github.com/panda3d/panda3d.git
synced 2025-10-01 17:35:34 -04:00
Overhauled T-Junction and border-decision math, added border stitching
This commit is contained in:
rdb
parent
92927fd25f
commit
d5af6f1cce
@ -1,6 +1,5 @@
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// Filename: geoMipTerrain.I
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// Created by: pro-rsoft (29jun07)
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// Last updated by: pro-rsoft (30oct08)
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//
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////////////////////////////////////////////////////////////////////
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//
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@ -40,6 +39,7 @@ GeoMipTerrain(const string &name) {
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_focal_is_temporary = true;
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_is_dirty = true;
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_bruteforce = false;
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_stitching = false;
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}
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////////////////////////////////////////////////////////////////////
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@ -420,45 +420,6 @@ lod_decide(unsigned short mx, unsigned short my) {
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// If the heightmap is not a power of two plus one,
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// it is scaled up using a gaussian filter.
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////////////////////////////////////////////////////////////////////
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INLINE bool GeoMipTerrain::
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set_heightfield(const Filename &filename, PNMFileType *ftype) {
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// First, we need to load the header to determine the size and format.
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PNMImageHeader imgheader;
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if (imgheader.read_header(filename, ftype)) {
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// Copy over the header to the heightfield image.
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_heightfield.copy_header_from(imgheader);
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if(!is_power_of_two(imgheader.get_x_size() - 1) || !is_power_of_two(imgheader.get_y_size() - 1)) {
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// Calculate the nearest power-of-two-plus-one size.
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unsigned int reqx, reqy;
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reqx = max(3, (int) pow(2.0, ceil(log((double) max(2, imgheader.get_x_size() - 1)) / log(2.0))) + 1);
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reqy = max(3, (int) pow(2.0, ceil(log((double) max(2, imgheader.get_y_size() - 1)) / log(2.0))) + 1);
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// If it's not a valid size, tell PNMImage to resize it.
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if (reqx != imgheader.get_x_size() || reqy != imgheader.get_y_size()) {
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grutil_cat.warning() << "Rescaling heightfield image " << filename << " to "
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<< reqx << " by " << reqy << " pixels\n";
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_heightfield.set_read_size(reqx, reqy);
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}
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}
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// Read the real image now
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if (!_heightfield.read(filename, ftype)) {
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_heightfield.clear_read_size();
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grutil_cat.error() << "Failed to read heightfield image " << filename << "!\n";
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return false;
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}
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_is_dirty = true;
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_xsize = _heightfield.get_x_size();
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_ysize = _heightfield.get_y_size();
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return true;
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} else {
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grutil_cat.error() << "Failed to load heightfield image " << filename << "!\n";
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}
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return false;
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}
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INLINE bool GeoMipTerrain::
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set_heightfield(const PNMImage &image) {
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// Before we apply anything, validate the size.
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@ -541,6 +502,37 @@ clear_color_map() {
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: GeoMipTerrain::set_border_stitching
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// Access: Published
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// Description: If this value is true, the LOD level at the
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// borders of the terrain will be 0. This is useful
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// if you have multiple terrains attached and you
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// want to stitch them together, to fix seams.
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// This setting also has effect when bruteforce is
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// enabled, although in that case you are probably
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// better off with setting the minlevels to the same
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// value.
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////////////////////////////////////////////////////////////////////
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INLINE void GeoMipTerrain::
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set_border_stitching(bool stitching) {
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if (stitching && !_stitching) {
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_is_dirty = true;
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}
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_stitching = stitching;
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}
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////////////////////////////////////////////////////////////////////
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// Function: GeoMipTerrain::get_stitching
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// Access: Published
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// Description: Returns the current stitching setting. False by
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// default, unless set_stitching has been set.
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////////////////////////////////////////////////////////////////////
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INLINE bool GeoMipTerrain::
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get_border_stitching() {
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return _stitching;
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}
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////////////////////////////////////////////////////////////////////
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// Function: GeoMipTerrain::get_pixel_value
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// Access: Private
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@ -587,33 +579,6 @@ get_normal(unsigned short mx, unsigned short my, int x, int y) {
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(my * _block_size + y));
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}
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////////////////////////////////////////////////////////////////////
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// Function: GeoMipTerrain::int2str
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// Access: Private
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// Description: Converts the given int to a std::string.
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////////////////////////////////////////////////////////////////////
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INLINE std::string GeoMipTerrain::
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int_to_str(int i) {
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std::stringstream ss;
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std::string str;
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ss << i;
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ss >> str;
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return str;
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}
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////////////////////////////////////////////////////////////////////
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// Function: GeoMipTerrain::str2int
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// Access: Private
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// Description: Converts the given std::string to an int.
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////////////////////////////////////////////////////////////////////
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INLINE int GeoMipTerrain::
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str_to_int(std::string str) {
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std::istringstream strin(str);
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int i;
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strin >> i;
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return i;
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}
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////////////////////////////////////////////////////////////////////
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// Function: GeoMipTerrain::is_power_of_two
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// Access: Private
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@ -1,6 +1,5 @@
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// Filename: geoMipTerrain.cxx
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// Created by: pro-rsoft (29jun07)
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// Last updated by: pro-rsoft (17jan09)
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//
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////////////////////////////////////////////////////////////////////
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//
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@ -82,17 +81,24 @@ generate_block(unsigned short mx,
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if (_bruteforce) {
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// LOD Level when rendering bruteforce is always 0 (no lod)
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// Unless a minlevel is set- this is handled later.
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level = 0;
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}
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// Do some calculations with the level
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level = min(short(max(_min_level, level)), short(_max_level));
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level = min(max(_min_level, level), _max_level);
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unsigned short reallevel = level;
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level = int(pow(2.0, int(level)));
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// Stores the max and min heights.
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float minh = 1.0f;
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float maxh = 0.0f;
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// Neighbor levels and junctions
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unsigned short lnlevel = get_neighbor_level(mx, my, -1, 0);
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unsigned short rnlevel = get_neighbor_level(mx, my, 1, 0);
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unsigned short bnlevel = get_neighbor_level(mx, my, 0, -1);
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unsigned short tnlevel = get_neighbor_level(mx, my, 0, 1);
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bool ljunction = (lnlevel != reallevel);
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bool rjunction = (rnlevel != reallevel);
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bool bjunction = (bnlevel != reallevel);
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bool tjunction = (tnlevel != reallevel);
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// Confusing note:
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// the variable level contains not the actual level as described
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@ -101,49 +107,43 @@ generate_block(unsigned short mx,
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// This is the number of vertices at the certain level.
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unsigned short lowblocksize = _block_size / level + 1;
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srand(time(NULL));
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for (int x = 0; x <= _block_size; x++) {
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for (int y = 0; y <= _block_size; y++) {
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if ((x % level) == 0 && (y % level) == 0) {
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if (_has_color_map) {
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LVecBase4d color = _color_map.get_xel_a(int((mx * _block_size + x)
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/ double(_xsize) * _color_map.get_x_size()),
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int((my * _block_size + y)
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/ double(_ysize) * _color_map.get_y_size()));
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cwriter.add_data4f(color.get_x(), color.get_y(),
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color.get_z(), color.get_w());
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//LVecBase4d color = _color_map.get_xel_a(int((mx * _block_size + x)
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/// double(_xsize) * _color_map.get_x_size()),
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// int((my * _block_size + y)
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// / double(_ysize) * _color_map.get_y_size()));
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//cwriter.add_data4f(LCAST(float, color));
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cwriter.add_data4f(rand() / float(RAND_MAX), rand() / float(RAND_MAX), rand() / float(RAND_MAX), 1);
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}
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float pval = get_pixel_value(mx, my, x, y);
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if (pval < minh) minh = pval;
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if (pval > maxh) maxh = pval;
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vwriter.add_data3f(x - 0.5 * _block_size, y - 0.5 * _block_size, pval);
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twriter.add_data2f((mx * _block_size + x) / double(_xsize - 1),
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(my * _block_size + y) / double(_ysize - 1));
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nwriter.add_data3f(get_normal(mx, my, x, y));
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if (x > 0 && y > 0) {
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//left border
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if (!_bruteforce && x == level && mx > 0 && _levels[mx - 1][my] > reallevel) {
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// Left border
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if (x == level && ljunction) {
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if (y > level && y < _block_size) {
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prim->add_vertex(min(max(sfav(y / level, _levels[mx - 1][my], reallevel), 0), lowblocksize - 1));
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prim->add_vertex(min(max(sfav(y / level, lnlevel, reallevel), 0), lowblocksize - 1));
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prim->add_vertex(vcounter - 1);
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prim->add_vertex(vcounter);
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prim->close_primitive();
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}
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if (f_part((y / level) / float(pow(2.0, int(_levels[mx - 1][my] - reallevel)))) == 0.5) {
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prim->add_vertex(min(max(sfav(y / level + 1, _levels[mx - 1][my], reallevel), 0), lowblocksize - 1));
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prim->add_vertex(min(max(sfav(y / level - 1, _levels[mx - 1][my], reallevel), 0), lowblocksize - 1));
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if (f_part((y / level) / float(pow(2.0, int(lnlevel - reallevel)))) == 0.5) {
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prim->add_vertex(min(max(sfav(y / level + 1, lnlevel, reallevel), 0), lowblocksize - 1));
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prim->add_vertex(min(max(sfav(y / level - 1, lnlevel, reallevel), 0), lowblocksize - 1));
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prim->add_vertex(vcounter);
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prim->close_primitive();
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}
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} else if (_bruteforce ||
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(!(y == level && x > level && x < _block_size && my > 0
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&& _levels[mx][my - 1] > reallevel) &&
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!(x == _block_size && mx < (_xsize - 1) / (_block_size) - 1
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&& _levels[mx + 1][my] > reallevel) &&
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!(x == _block_size && y > level && y < _block_size && mx < (_xsize - 1) / (_block_size) - 1
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&& _levels[mx + 1][my] > reallevel) &&
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!(y == _block_size && x > level && x < _block_size && my < (_ysize - 1) / (_block_size) - 1
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&& _levels[mx][my + 1] > reallevel))) {
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} else if (
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(!(bjunction && y == level && x > level && x < _block_size) &&
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!(rjunction && x == _block_size) &&
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!(tjunction && y == _block_size && x > level && x < _block_size))) {
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if ((x <= center && y <= center) || (x > center && y > center)) {
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if (x > center) {
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prim->add_vertex(vcounter - lowblocksize - 1);
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@ -167,36 +167,39 @@ generate_block(unsigned short mx,
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}
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prim->close_primitive();
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}
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//right border
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if (!_bruteforce && x == _block_size - level && mx < (_xsize - 1) / (_block_size) - 1 && _levels[mx + 1][my] > reallevel) {
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if (y > level && y < _block_size - level + 1) {
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prim->add_vertex(lowblocksize * (lowblocksize - 1) + min(max(sfav(y / level, _levels[mx + 1][my], reallevel), 0), lowblocksize - 1));
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// Right border
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if (x == _block_size - level && rjunction) {
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if (y > level && y < _block_size) {
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prim->add_vertex(lowblocksize * (lowblocksize - 1) + min(max(sfav(y / level, rnlevel, reallevel), 0), lowblocksize - 1));
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prim->add_vertex(vcounter);
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prim->add_vertex(vcounter - 1);
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prim->close_primitive();
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}
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if (f_part((y / level)/float(pow(2.0, int(_levels[mx + 1][my]-reallevel)))) == 0.5) {
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prim->add_vertex(lowblocksize * (lowblocksize - 1) + min(max(sfav(y / level - 1, _levels[mx + 1][my], reallevel), 0), lowblocksize - 1));
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prim->add_vertex(lowblocksize * (lowblocksize - 1) + min(max(sfav(y / level + 1, _levels[mx + 1][my], reallevel), 0), lowblocksize - 1));
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if (f_part((y / level) / float(pow(2.0, int(rnlevel - reallevel)))) == 0.5) {
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prim->add_vertex(lowblocksize * (lowblocksize - 1) + min(max(sfav(y / level - 1, rnlevel, reallevel), 0), lowblocksize - 1));
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prim->add_vertex(lowblocksize * (lowblocksize - 1) + min(max(sfav(y / level + 1, rnlevel, reallevel), 0), lowblocksize - 1));
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prim->add_vertex(vcounter);
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prim->close_primitive();
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}
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}
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//bottom border
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if (!_bruteforce && y == level && my > 0 && _levels[mx][my - 1] > reallevel) {
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// Bottom border
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if (y == level && bjunction) {
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if (x > level && x < _block_size) {
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prim->add_vertex(vcounter);
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prim->add_vertex(vcounter - lowblocksize);
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prim->add_vertex(min(max(sfav(x / level, _levels[mx][my - 1], reallevel), 0), lowblocksize - 1) * lowblocksize);
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prim->add_vertex(min(max(sfav(x / level, bnlevel, reallevel), 0), lowblocksize - 1) * lowblocksize);
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prim->close_primitive();
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}
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if (f_part((x / level)/float(pow(2.0, int(_levels[mx][my - 1]-reallevel)))) == 0.5) {
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prim->add_vertex(min(max(sfav(x / level - 1, _levels[mx][my - 1], reallevel), 0), lowblocksize - 1) * lowblocksize);
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prim->add_vertex(min(max(sfav(x / level + 1, _levels[mx][my - 1], reallevel), 0), lowblocksize - 1) * lowblocksize);
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if (f_part((x / level) / float(pow(2.0, int(bnlevel - reallevel)))) == 0.5) {
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prim->add_vertex(min(max(sfav(x / level - 1, bnlevel, reallevel), 0), lowblocksize - 1) * lowblocksize);
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prim->add_vertex(min(max(sfav(x / level + 1, bnlevel, reallevel), 0), lowblocksize - 1) * lowblocksize);
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prim->add_vertex(vcounter);
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prim->close_primitive();
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}
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} else if (_bruteforce || (!(x == level && y > level && y < _block_size && mx > 0 && _levels[mx - 1][my] > reallevel) && !(x == _block_size && y > level && y < _block_size && mx < (_xsize - 1) / (_block_size) - 1 && _levels[mx + 1][my] > reallevel) && !(x == _block_size && y > level && y < _block_size && mx < (_xsize - 1) / (_block_size) - 1 && _levels[mx + 1][my] > reallevel) && !(y == _block_size && my < (_ysize - 1) / (_block_size) - 1 && _levels[mx][my + 1] > reallevel))) {
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} else if (
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(!(ljunction && x == level && y > level && y < _block_size) &&
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!(tjunction && y == _block_size) &&
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!(rjunction && x == _block_size && y > level && y < _block_size))) {
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if ((x <= center && y <= center) || (x > center && y > center)) {
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if (y > center) {
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prim->add_vertex(vcounter);
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@ -220,17 +223,17 @@ generate_block(unsigned short mx,
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}
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prim->close_primitive();
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}
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//top border
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if (!_bruteforce && y == _block_size - level && my < (_xsize - 1) / (_block_size) - 1 && _levels[mx][my + 1] > reallevel) {
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if (x > level && x < _block_size - level + 1) {
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prim->add_vertex(min(max(sfav(x / level, _levels[mx][my + 1], reallevel), 0), lowblocksize - 1) * lowblocksize + lowblocksize - 1);
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// Top border
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if (y == _block_size - level && tjunction) {
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if (x > level && x < _block_size) {
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prim->add_vertex(min(max(sfav(x / level, tnlevel, reallevel), 0), lowblocksize - 1) * lowblocksize + lowblocksize - 1);
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prim->add_vertex(vcounter - lowblocksize);
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prim->add_vertex(vcounter);
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prim->close_primitive();
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}
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if (f_part((x / level)/float(pow(2.0, int(_levels[mx][my + 1]-reallevel)))) == 0.5) {
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prim->add_vertex(min(max(sfav(x / level + 1, _levels[mx][my + 1], reallevel), 0), lowblocksize - 1) * lowblocksize + lowblocksize - 1);
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prim->add_vertex(min(max(sfav(x / level - 1, _levels[mx][my + 1], reallevel), 0), lowblocksize - 1) * lowblocksize + lowblocksize - 1);
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if (f_part((x / level) / float(pow(2.0, int(tnlevel - reallevel)))) == 0.5) {
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prim->add_vertex(min(max(sfav(x / level + 1, tnlevel, reallevel), 0), lowblocksize - 1) * lowblocksize + lowblocksize - 1);
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prim->add_vertex(min(max(sfav(x / level - 1, tnlevel, reallevel), 0), lowblocksize - 1) * lowblocksize + lowblocksize - 1);
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prim->add_vertex(vcounter);
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prim->close_primitive();
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}
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@ -244,8 +247,10 @@ generate_block(unsigned short mx,
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PT(Geom) geom = new Geom(vdata);
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geom->add_primitive(prim);
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geom->set_bounds_type(BoundingVolume::BT_box);
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PT(GeomNode) node = new GeomNode("gmm" + int_to_str(mx) + "x" + int_to_str(my));
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ostringstream sname;
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sname << "gmm" << mx << "x" << my;
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PT(GeomNode) node = new GeomNode(sname.str());
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node->add_geom(geom);
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node->set_bounds_type(BoundingVolume::BT_box);
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_old_levels.at(mx).at(my) = reallevel;
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@ -381,7 +386,7 @@ generate() {
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_root_flattened = false;
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for (unsigned int mx = 0; mx < (_xsize - 1) / _block_size; mx++) {
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_old_levels[mx].resize(int((_ysize - 1) / _block_size));
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pvector<NodePath> tvector; //create temporary row
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pvector<NodePath> tvector; // Create temporary row
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for (unsigned int my = 0; my < (_ysize - 1) / _block_size; my++) {
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if (_bruteforce) {
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tvector.push_back(_root.attach_new_node(generate_block(mx, my, 0)));
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@ -390,7 +395,7 @@ generate() {
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}
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tvector[my].set_pos((mx + 0.5) * _block_size, (my + 0.5) * _block_size, 0);
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}
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_blocks.push_back(tvector); //push the new row of NodePaths into the 2d vect
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_blocks.push_back(tvector); // Push the new row of NodePaths into the 2d vect
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tvector.clear();
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}
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auto_flatten();
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@ -600,3 +605,77 @@ update_block(unsigned short mx, unsigned short my,
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return false;
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}
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////////////////////////////////////////////////////////////////////
|
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// Function: GeoMipTerrain::set_heightfield
|
||||
// Access: Published
|
||||
// Description: Loads the specified heightmap image file into
|
||||
// the heightfield. Returns true if succeeded, or
|
||||
// false if an error has occured.
|
||||
// If the heightmap is not a power of two plus one,
|
||||
// it is scaled up using a gaussian filter.
|
||||
////////////////////////////////////////////////////////////////////
|
||||
bool GeoMipTerrain::
|
||||
set_heightfield(const Filename &filename, PNMFileType *ftype) {
|
||||
// First, we need to load the header to determine the size and format.
|
||||
PNMImageHeader imgheader;
|
||||
if (imgheader.read_header(filename, ftype)) {
|
||||
// Copy over the header to the heightfield image.
|
||||
_heightfield.copy_header_from(imgheader);
|
||||
|
||||
if(!is_power_of_two(imgheader.get_x_size() - 1) || !is_power_of_two(imgheader.get_y_size() - 1)) {
|
||||
// Calculate the nearest power-of-two-plus-one size.
|
||||
unsigned int reqx, reqy;
|
||||
reqx = max(3, (int) pow(2.0, ceil(log((double) max(2, imgheader.get_x_size() - 1)) / log(2.0))) + 1);
|
||||
reqy = max(3, (int) pow(2.0, ceil(log((double) max(2, imgheader.get_y_size() - 1)) / log(2.0))) + 1);
|
||||
|
||||
// If it's not a valid size, tell PNMImage to resize it.
|
||||
if (reqx != imgheader.get_x_size() || reqy != imgheader.get_y_size()) {
|
||||
grutil_cat.warning() << "Rescaling heightfield image " << filename << " to "
|
||||
<< reqx << " by " << reqy << " pixels\n";
|
||||
_heightfield.set_read_size(reqx, reqy);
|
||||
}
|
||||
}
|
||||
|
||||
// Read the real image now
|
||||
if (!_heightfield.read(filename, ftype)) {
|
||||
_heightfield.clear_read_size();
|
||||
grutil_cat.error() << "Failed to read heightfield image " << filename << "!\n";
|
||||
return false;
|
||||
}
|
||||
|
||||
_is_dirty = true;
|
||||
_xsize = _heightfield.get_x_size();
|
||||
_ysize = _heightfield.get_y_size();
|
||||
return true;
|
||||
} else {
|
||||
grutil_cat.error() << "Failed to load heightfield image " << filename << "!\n";
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
////////////////////////////////////////////////////////////////////
|
||||
// Function: GeoMipTerrain::get_neighbor_level
|
||||
// Access: Private
|
||||
// Description: Helper function for generate().
|
||||
////////////////////////////////////////////////////////////////////
|
||||
unsigned short GeoMipTerrain::
|
||||
get_neighbor_level(unsigned short mx, unsigned short my, short dmx, short dmy) {
|
||||
// If we're across the terrain border, check if we want stitching.
|
||||
// If not, return the same level as this one - it won't have to make junctions.
|
||||
if (mx + dmx < 0 || mx + dmx >= (_xsize - 1) / _block_size ||
|
||||
my + dmy < 0 || my + dmy >= (_ysize - 1) / _block_size) {
|
||||
return (_stitching) ? _max_level : min(max(_min_level, _levels[mx][my]), _max_level);
|
||||
}
|
||||
// If we're rendering bruteforce, the level must be the same as this one.
|
||||
if (_bruteforce) {
|
||||
return min(max(_min_level, _levels[mx][my]), _max_level);
|
||||
}
|
||||
// Only if the level is higher than the current.
|
||||
// Otherwise, the junctions will be made for the other chunk.
|
||||
if (_levels[mx + dmx][my + dmy] > _levels[mx][my]) {
|
||||
return min(max(_min_level, _levels[mx + dmx][my + dmy]), _max_level);
|
||||
} else {
|
||||
return min(max(_min_level, _levels[mx][my]), _max_level);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@ -1,6 +1,5 @@
|
||||
// Filename: geoMipTerrain.h
|
||||
// Created by: pro-rsoft (29jun07)
|
||||
// Last updated by: pro-rsoft (25sep08)
|
||||
//
|
||||
////////////////////////////////////////////////////////////////////
|
||||
//
|
||||
@ -44,8 +43,7 @@ PUBLISHED:
|
||||
INLINE ~GeoMipTerrain();
|
||||
|
||||
INLINE PNMImage &heightfield();
|
||||
INLINE bool set_heightfield(const Filename &filename,
|
||||
PNMFileType *type = NULL);
|
||||
bool set_heightfield(const Filename &filename, PNMFileType *type = NULL);
|
||||
INLINE bool set_heightfield(const PNMImage &image);
|
||||
INLINE bool set_heightfield(const string &path);
|
||||
INLINE PNMImage &color_map();
|
||||
@ -104,6 +102,8 @@ PUBLISHED:
|
||||
INLINE const NodePath get_block_node_path(unsigned short mx,
|
||||
unsigned short my);
|
||||
INLINE LVecBase2f get_block_from_pos(double x, double y);
|
||||
INLINE void set_border_stitching(bool stitching);
|
||||
INLINE bool get_border_stitching();
|
||||
|
||||
PNMImage make_slope_image();
|
||||
void generate();
|
||||
@ -118,8 +118,6 @@ private:
|
||||
void auto_flatten();
|
||||
bool root_flattened();
|
||||
|
||||
INLINE std::string int_to_str(int i);
|
||||
INLINE int str_to_int(std::string str);
|
||||
INLINE bool is_power_of_two(unsigned int i);
|
||||
INLINE float f_part(float i);
|
||||
INLINE double f_part(double i);
|
||||
@ -127,6 +125,7 @@ private:
|
||||
INLINE double get_pixel_value(int x, int y);
|
||||
INLINE double get_pixel_value(unsigned short mx, unsigned short my, int x, int y);
|
||||
INLINE unsigned short lod_decide(unsigned short mx, unsigned short my);
|
||||
unsigned short get_neighbor_level(unsigned short mx, unsigned short my, short dmx, short dmy);
|
||||
|
||||
NodePath _root;
|
||||
int _auto_flatten;
|
||||
@ -147,6 +146,7 @@ private:
|
||||
NodePath _focal_point;
|
||||
bool _focal_is_temporary;
|
||||
unsigned short _min_level;
|
||||
bool _stitching;
|
||||
pvector<pvector<NodePath> > _blocks;
|
||||
pvector<pvector<unsigned short> > _levels;
|
||||
pvector<pvector<unsigned short> > _old_levels;
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user