From b03e66e75fb79b503d48bc21dab0d67415516d4a Mon Sep 17 00:00:00 2001 From: Sergey Sharybin Date: Thu, 7 Jul 2016 12:18:57 +0200 Subject: Cycles: Implement unaligned nodes BVH builder This is a special builder type which is allowed to orient nodes to strands direction, hence minimizing their surface area in comparison with axis-aligned nodes. Such nodes are much more efficient for hair rendering. Implementation of BVH builder is based on Embree, and generally idea there is to calculate axis-aligned SAH and oriented SAH and if SAH of oriented node is smaller than axis-aligned SAH we create unaligned node. We store both aligned and unaligned nodes in the same tree (which seems to be different from what Embree is doing) so we don't have any any extra calculations needed to set up hair ray for BVH traversal, hence avoiding any possible negative effect of this new BVH nodes type. This new builder is currently not in use, still need to make BVH traversal code aware of unaligned nodes. --- intern/cycles/render/mesh.h | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) (limited to 'intern/cycles/render/mesh.h') diff --git a/intern/cycles/render/mesh.h b/intern/cycles/render/mesh.h index bc3d30af499..0aea55544f2 100644 --- a/intern/cycles/render/mesh.h +++ b/intern/cycles/render/mesh.h @@ -72,7 +72,15 @@ public: int num_segments() { return num_keys - 1; } - void bounds_grow(const int k, const float3 *curve_keys, const float *curve_radius, BoundBox& bounds) const; + void bounds_grow(const int k, + const float3 *curve_keys, + const float *curve_radius, + BoundBox& bounds) const; + void bounds_grow(const int k, + const float3 *curve_keys, + const float *curve_radius, + const Transform& aligned_space, + BoundBox& bounds) const; }; Curve get_curve(size_t i) const @@ -172,7 +180,11 @@ public: size_t vert_offset, size_t tri_offset); void pack_curves(Scene *scene, float4 *curve_key_co, float4 *curve_data, size_t curvekey_offset); - void compute_bvh(SceneParams *params, Progress *progress, int n, int total); + void compute_bvh(DeviceScene *dscene, + SceneParams *params, + Progress *progress, + int n, + int total); bool need_attribute(Scene *scene, AttributeStandard std); bool need_attribute(Scene *scene, ustring name); -- cgit v1.2.3