[Bf-blender-cvs] [3600bb79d05] master: Fix T60803 Artifacts with SSR + Reflection Plane + 0 roughness

[Clément Foucault]

Commit: 3600bb79d05d9a115ca036f1dcb864205ef3c0ce
Author: Clément Foucault
Date:   Sat Mar 16 00:50:50 2019 +0100
Branches: master
https://developer.blender.org/rB3600bb79d05d9a115ca036f1dcb864205ef3c0ce

Fix T60803 Artifacts with SSR + Reflection Plane + 0 roughness

Tweaked the tracing parameters again to avoid rays terminated before first
iteration.

===================================================================

M	source/blender/draw/engines/eevee/shaders/raytrace_lib.glsl

===================================================================

diff --git a/source/blender/draw/engines/eevee/shaders/raytrace_lib.glsl b/source/blender/draw/engines/eevee/shaders/raytrace_lib.glsl
index 80389402129..85c4a02bc1e 100644
--- a/source/blender/draw/engines/eevee/shaders/raytrace_lib.glsl
+++ b/source/blender/draw/engines/eevee/shaders/raytrace_lib.glsl
@@ -91,7 +91,7 @@ void prepare_raycast(
 
 	/* If the line is degenerate, make it cover at least one pixel
 	 * to not have to handle zero-pixel extent as a special case later */
-	ss_step.xy += vec2((dot(ss_step.xy, ss_step.xy) < 0.000003) ? 0.001 : 0.0);
+	ss_step.xy += vec2((dot(ss_step.xy, ss_step.xy) < 0.00001) ? 0.001 : 0.0);
 
 	/* Make ss_step cover one pixel. */
 	ss_step /= max(abs(ss_step.x), abs(ss_step.y));
@@ -135,7 +135,7 @@ vec3 raycast(
 	float max_time;
 	prepare_raycast(ray_origin, ray_dir, thickness, index, ss_step, ss_start, max_time);
 
-	float max_trace_time = max(0.001, max_time - 0.01);
+	float max_trace_time = max(0.01, max_time - 0.01);
 
 #ifdef GROUPED_FETCHES
 	ray_jitter *= 0.25;