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gobj: support infinite near distance in PerspectiveLens

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Useful when rendering with near/far planes flipped around.
This commit is contained in:
rdb 2018-07-17 22:59:54 +02:00
parent eafab53729
commit cf240d95c1
1 changed files with 5 additions and 0 deletions
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5
panda/src/gobj/perspectiveLens.cxx
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@ -71,9 +71,14 @@ do_compute_projection_mat(Lens::CData *lens_cdata) {
PN_stdfloat fNear = do_get_near(lens_cdata);
PN_stdfloat a, b;
// Take the limits if either near or far is infinite.
if (cinf(fFar)) {
a = 1;
b = -2 * fNear;
} else if (cinf(fNear)) {
// This is valid if the near/far planes are inverted.
a = -1;
b = 2 * fFar;
} else {
PN_stdfloat far_minus_near = fFar-fNear;
a = (fFar + fNear);