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gobj: performance improvement for CPU animation

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In particular it seems that decomposition is slow, so the code to handle the transformation of the normal column now tries harder to avoid it, especially in the case of a scale of 1.

Also see #222
This commit is contained in:
rdb 2018-01-08 21:26:43 +01:00
parent 5831a31509
commit ba9ea065e4
1 changed files with 12 additions and 8 deletions
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20
panda/src/gobj/geomVertexData.cxx
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@ -1836,17 +1836,21 @@ do_transform_vector_column(const GeomVertexFormat *format, GeomVertexRewriter &d
bool normalize = false;
if (data_column->get_contents() == C_normal) {
// This is to preserve perpendicularity to the surface.
LVecBase3 scale, shear, hpr;
if (decompose_matrix(mat.get_upper_3(), scale, shear, hpr) &&
IS_NEARLY_EQUAL(scale[0], scale[1]) &&
IS_NEARLY_EQUAL(scale[0], scale[2])) {
if (scale[0] == 1) {
LVecBase3 scale_sq(mat.get_row3(0).length_squared(),
mat.get_row3(1).length_squared(),
mat.get_row3(2).length_squared());
if (IS_THRESHOLD_EQUAL(scale_sq[0], scale_sq[1], 2.0e-3f) &&
IS_THRESHOLD_EQUAL(scale_sq[0], scale_sq[2], 2.0e-3f)) {
// There is a uniform scale.
LVecBase3 scale, shear, hpr;
if (IS_THRESHOLD_EQUAL(scale_sq[0], 1, 2.0e-3f)) {
// No scale to worry about.
xform = mat;
} else {
// Simply take the uniform scale out of the transformation. Not sure
// if it might be better to just normalize?
} else if (decompose_matrix(mat.get_upper_3(), scale, shear, hpr)) {
// Make a new matrix with scale/translate taken out of the equation.
compose_matrix(xform, LVecBase3(1, 1, 1), shear, hpr, LVecBase3::zero());
} else {
normalize = true;
}
} else {
// There is a non-uniform scale, so we need to do all this to preserve