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Cycles: multiple importance sampling for lamps, which helps reduce noise for

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big lamps and sharp glossy reflections. This was already supported for mesh
lights and the background, so lamps should do it too.

This is not for free and it's a bit slower than I hoped even though there is
no extra BVH ray intersection. I'll try to optimize it more later.

* Area lights look a bit different now, they had the wrong shape before.
* Also fixes a sampling issue in the non-progressive integrator.
* Only enabled for the CPU, will test on the GPU later.
* An option to disable this will be added for situations where it does not help.

Same time comparison before/after:
http://www.pasteall.org/pic/show.php?id=43313
http://www.pasteall.org/pic/show.php?id=43314
This commit is contained in:
Brecht Van Lommel
2013-01-09 21:09:20 +00:00
parent 97d1abfe95
commit ad10cbf04a
10 changed files with 586 additions and 200 deletions
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8
intern/cycles/blender/blender_object.cpp
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@@ -127,8 +127,8 @@ void BlenderSync::sync_light(BL::Object b_parent, int persistent_id[OBJECT_PERSI
case BL::Lamp::type_AREA: {
BL::AreaLamp b_area_lamp(b_lamp);
light->size = 1.0f;
light->axisu = make_float3(tfm.x.x, tfm.y.x, tfm.z.x);
light->axisv = make_float3(tfm.x.y, tfm.y.y, tfm.z.y);
light->axisu = transform_get_column(&tfm, 0);
light->axisv = transform_get_column(&tfm, 1);
light->sizeu = b_area_lamp.size();
if(b_area_lamp.shape() == BL::AreaLamp::shape_RECTANGLE)
light->sizev = b_area_lamp.size_y();
@@ -140,8 +140,8 @@ void BlenderSync::sync_light(BL::Object b_parent, int persistent_id[OBJECT_PERSI
}
/* location and (inverted!) direction */
light->co = make_float3(tfm.x.w, tfm.y.w, tfm.z.w);
light->dir = -make_float3(tfm.x.z, tfm.y.z, tfm.z.z);
light->co = transform_get_column(&tfm, 3);
light->dir = -transform_get_column(&tfm, 2);
/* shader */
vector<uint> used_shaders;