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light: phong: reduce epsilon used for barycentric coordinates test. fixes interpolation on testphongtjunc.map

This commit is contained in:
Eric Wasylishen 2016-05-27 22:06:17 -06:00
parent a63a96e877
commit 496fc4d52e
1 changed files with 4 additions and 1 deletions
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5
light/ltface.c
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@ -484,8 +484,11 @@ static void CalcPointNormal(const bsp2_t *bsp, const bsp2_dface_t *face, vec_t *
vec3_t bary;
CalcBarycentric(pointOnPlane, v1, v2, v3, bary);
if ((bary[0] > -ON_EPSILON) && (bary[1] > -ON_EPSILON) && (bary[0] + bary[1] < 1+ON_EPSILON))
// N.B. need a small epsilon here because the barycentric coordinates are normalized to 0-1
const vec_t BARY_EPSILON = 0.001;
if ((bary[0] > -BARY_EPSILON) && (bary[1] > -BARY_EPSILON) && (bary[0] + bary[1] < 1+BARY_EPSILON))
{
// area test rejects the case when v1, v2, v3 are colinear
if (TriangleArea(v1, v2, v3) >= 1) {
v1 = GetSurfaceVertexNormal(bsp, face, 0);