[Bf-blender-cvs] [968093ec2f6] master: Fix T51862: principled shader GLSL artifacts in ortho mode.

[Brecht Van Lommel]

Commit: 968093ec2f6def428f25437372b1cca5a27eb209
Author: Brecht Van Lommel
Date:   Wed Jun 21 21:31:08 2017 +0200
Branches: master
https://developer.blender.org/rB968093ec2f6def428f25437372b1cca5a27eb209

Fix T51862: principled shader GLSL artifacts in ortho mode.

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M	source/blender/gpu/shaders/gpu_shader_material.glsl

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diff --git a/source/blender/gpu/shaders/gpu_shader_material.glsl b/source/blender/gpu/shaders/gpu_shader_material.glsl
index a7ff8c1529f..ef2060122e0 100644
--- a/source/blender/gpu/shaders/gpu_shader_material.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_material.glsl
@@ -2630,7 +2630,7 @@ void node_bsdf_principled(vec4 base_color, float subsurface, vec3 subsurface_rad
 	float eta = (2.0 / (1.0 - sqrt(0.08 * specular))) - 1.0;
 
 	/* set the viewing vector */
-	vec3 V = -normalize(I);
+	vec3 V = (gl_ProjectionMatrix[3][3] == 0.0) ? -normalize(I) : vec3(0.0, 0.0, 1.0);
 
 	/* get the tangent */
 	vec3 Tangent = T;