Eevee: Fix contact shadow creating to overshadowing

This was because the shadow rays could be generated below the geometric normal.
Referenced by issue #63627, Light Leak between normal shadows and contact shadows in Eevee Referenced by issue #57752, EEVEE and backlighting
2018-10-28 19:24:56 +01:00 · 2018-10-28 19:24:56 +01:00 · 61e4e3178d · 2023-02-14 05:03:36 +01:00
parent f15afc47ed
commit 61e4e3178d
1 changed files with 4 additions and 0 deletions
--- a/source/blender/draw/engines/eevee/shaders/lamps_lib.glsl
+++ b/source/blender/draw/engines/eevee/shaders/lamps_lib.glsl
@ -226,6 +226,10 @@ float light_visibility(LightData ld, vec3 W,

 			vec3 ray_ori = viewPosition;

+			if (dot(viewNormal, ray_dir) <= 0.0) {
+				return vis;
+			}
+
 			float bias = 0.5; /* Constant Bias */
 			bias += 1.0 - abs(dot(viewNormal, ray_dir)); /* Angle dependent bias */
 			bias *= gl_FrontFacing ? data.sh_contact_offset : -data.sh_contact_offset;