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;

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