Omar Emara
1c2f7b022a
The Random Per Island attribute is a random float associated with each connected component (island) of the mesh. It is particularly useful when artists want to add variations to meshes composed of separate units. Like tree leaves created using particle systems, wood planks created using array modifiers, or abstract splines created using AN. Reviewed By: Sergey Sharybin, Jacques Lucke Differential Revision: https://developer.blender.org/D6154
49 lines
1.4 KiB
GLSL
49 lines
1.4 KiB
GLSL
void node_geometry(vec3 I,
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vec3 N,
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vec3 orco,
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mat4 objmat,
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mat4 toworld,
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vec2 barycentric,
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out vec3 position,
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out vec3 normal,
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out vec3 tangent,
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out vec3 true_normal,
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out vec3 incoming,
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out vec3 parametric,
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out float backfacing,
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out float pointiness,
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out float random_per_island)
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{
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/* handle perspective/orthographic */
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vec3 I_view = (ProjectionMatrix[3][3] == 0.0) ? normalize(I) : vec3(0.0, 0.0, -1.0);
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incoming = -(toworld * vec4(I_view, 0.0)).xyz;
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#if defined(WORLD_BACKGROUND) || defined(PROBE_CAPTURE)
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position = -incoming;
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true_normal = normal = incoming;
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tangent = parametric = vec3(0.0);
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vec3(0.0);
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backfacing = 0.0;
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pointiness = 0.0;
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#else
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position = worldPosition;
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# ifndef VOLUMETRICS
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normal = normalize(N);
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vec3 B = dFdx(worldPosition);
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vec3 T = dFdy(worldPosition);
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true_normal = normalize(cross(B, T));
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# else
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normal = (toworld * vec4(N, 0.0)).xyz;
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true_normal = normal;
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# endif
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tangent_orco_z(orco, orco);
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node_tangent(N, orco, objmat, tangent);
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parametric = vec3(barycentric, 0.0);
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backfacing = (gl_FrontFacing) ? 0.0 : 1.0;
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pointiness = 0.5;
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random_per_island = 0.0;
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#endif
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}
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