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EEVEE: SSR: Check reflection ray against geometric normal 

This improve self intersection prevention. Also reduce the bias
that was making a lot of rays not being shoot at grazing angles.
This commit is contained in:
Clément Foucault 2021-03-03 13:20:23 +01:00
parent 1c22b551d0
commit f746b568f3
1 changed files with 8 additions and 9 deletions
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17
source/blender/draw/engines/eevee/shaders/effect_ssr_frag.glsl
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@ -80,25 +80,24 @@ void do_ssr(vec3 V, vec3 N, vec3 T, vec3 B, vec3 vP, float a2, vec4 rand)
vec3 H = sample_ggx(rand.xzw, a2, N, T, B, NH);
vec3 R = reflect(-V, H);
const float bad_ray_threshold = 0.01;
vec3 vNg = safe_normalize(cross(dFdx(vP), dFdy(vP)));
/* If ray is bad (i.e. going below the surface) regenerate. */
/* This threshold is a bit higher than 0 to improve self intersection cases. */
const float bad_ray_threshold = 0.085;
if (dot(R, N) <= bad_ray_threshold) {
if (dot(R, vNg) < bad_ray_threshold) {
H = sample_ggx(rand.xzw * vec3(1.0, -1.0, -1.0), a2, N, T, B, NH);
R = reflect(-V, H);
}
if (dot(R, N) <= bad_ray_threshold) {
if (dot(R, vNg) < bad_ray_threshold) {
H = sample_ggx(rand.xzw * vec3(1.0, 1.0, -1.0), a2, N, T, B, NH);
R = reflect(-V, H);
}
if (dot(R, N) <= bad_ray_threshold) {
if (dot(R, vNg) < bad_ray_threshold) {
H = sample_ggx(rand.xzw * vec3(1.0, -1.0, 1.0), a2, N, T, B, NH);
R = reflect(-V, H);
}
if (dot(R, N) <= bad_ray_threshold) {
if (dot(R, vNg) < bad_ray_threshold) {
/* Not worth tracing. */
return;
}