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added slope image

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rdb 2008-10-11 10:00:25 +00:00
parent 58f3f8f322
commit 15dba6ef35
2 changed files with 35 additions and 4 deletions
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38
panda/src/grutil/geoMipTerrain.cxx
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@ -292,10 +292,10 @@ get_elevation(double x, double y) {
// accurate normals, please divide it by the
// terrain scale and normalize it again, like this:
//
// LVector3f normal (terr.get_normal(mx, my, x, y));
// normal.set(normal.get_x() / terr.get_sx(),
// normal.get_y() / terr.get_sy(),
// normal.get_z() / terr.get_sz());
// LVector3f normal (terr.get_normal(x, y));
// normal.set(normal.get_x() / root.get_sx(),
// normal.get_y() / root.get_sy(),
// normal.get_z() / root.get_sz());
// normal.normalize();
////////////////////////////////////////////////////////////////////
LVector3f GeoMipTerrain::
@ -316,6 +316,36 @@ get_normal(int x, int y) {
return normal;
}
////////////////////////////////////////////////////////////////////
// Function: GeoMipTerrain::make_slope_image
// Access: Published
// Description: Returns a new grayscale image containing the slope
// angles. A pixel value of 1.0 will mean 90 degrees,
// meaning, horizontal, a pixel value of 0.0 will
// mean 0 degrees, or entirely vertical.
// The resulting image will have the same size as the
// heightfield image.
// The scale will be taken into respect -- meaning,
// if you change the terrain scale, the slope image
// will need to be regenerated in order to be correct.
////////////////////////////////////////////////////////////////////
PNMImage GeoMipTerrain::
make_slope_image() {
PNMImage result (_xsize, _ysize);
result.make_grayscale();
for (int x = 0; x < _xsize; ++x) {
for (int y = 0; y < _ysize; ++y) {
LVector3f normal (get_normal(x, y));
normal.set(normal.get_x() / _root.get_sx(),
normal.get_y() / _root.get_sy(),
normal.get_z() / _root.get_sz());
normal.normalize();
result.set_gray(x, y, normal.angle_deg(LVector3f::up()) / 90.0);
}
}
return result;
}
////////////////////////////////////////////////////////////////////
// Function: GeoMipTerrain::generate
// Access: Published

1
panda/src/grutil/geoMipTerrain.h
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@ -105,6 +105,7 @@ PUBLISHED:
unsigned short my);
INLINE LVecBase2f get_block_from_pos(double x, double y);
PNMImage make_slope_image();
void generate();
bool update();