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Eevee: Fix extinction of Light parallel to views. 

This was a problem with orthographic views and lights without rotations. This introduce a small bias that should fix most cases.
This commit is contained in:
Clément Foucault 2017-09-12 16:18:18 +02:00
parent fc42063d1e
commit 07e6e5edfb
1 changed files with 8 additions and 2 deletions
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10
source/blender/draw/engines/eevee/shaders/ltc_lib.glsl
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@ -161,9 +161,12 @@ mat3 ltc_matrix(vec4 lut)
float ltc_evaluate(vec3 N, vec3 V, mat3 Minv, vec3 corners[4])
{
/* Avoid dot(N, V) == 1 in ortho mode, leading T1 normalize to fail. */
V = normalize(V + 1e-8);
/* construct orthonormal basis around N */
vec3 T1, T2;
T1 = normalize(V - N*dot(V, N));
T1 = normalize(V - N * dot(N, V));
T2 = cross(N, T1);
/* rotate area light in (T1, T2, R) basis */
@ -206,9 +209,12 @@ float ltc_evaluate(vec3 N, vec3 V, mat3 Minv, vec3 corners[4])
#define LTC_CIRCLE_RES 8
float ltc_evaluate_circle(vec3 N, vec3 V, mat3 Minv, vec3 p[LTC_CIRCLE_RES])
{
/* Avoid dot(N, V) == 1 in ortho mode, leading T1 normalize to fail. */
V = normalize(V + 1e-8);
/* construct orthonormal basis around N */
vec3 T1, T2;
T1 = normalize(V - N*dot(V, N));
T1 = normalize(V - N * dot(V, N));
T2 = cross(N, T1);
/* rotate area light in (T1, T2, R) basis */