New feature

Patch [#33445] - Experimental Cycles Hair Rendering (CPU only)

This patch allows hair data to be exported to cycles and introduces a new line segment primitive to render with.

The UI appears under the particle tab and there is a new hair info node available.

It is only available under the experimental feature set and for cpu rendering.

1 files changed, 6 insertions, 3 deletions

diff --git a/intern/cycles/bvh/bvh.h b/intern/cycles/bvh/bvh.h
index 549f1e3ac1d..d81bb312148 100644
--- a/intern/cycles/bvh/bvh.h
+++ b/intern/cycles/bvh/bvh.h
@@ -51,7 +51,9 @@ struct PackedBVH {
 	/* object index to BVH node index mapping for instances */
 	array<int> object_node; 
 	/* precomputed triangle intersection data, one triangle is 4x float4 */
-	array<float4> tri_woop; 
+	array<float4> tri_woop;
+	/* primitive type - triangle or strand (should be moved to flag?) */
+	array<int> prim_type;
 	/* visibility visibilitys for primitives */
 	array<uint> prim_visibility;
 	/* mapping from BVH primitive index to true primitive index, as primitives
@@ -101,9 +103,10 @@ protected:
 	bool cache_read(CacheData& key);
 	void cache_write(CacheData& key);
 
-	/* triangles */
-	void pack_triangles();
+	/* triangles and strands*/
+	void pack_primitives();
 	void pack_triangle(int idx, float4 woop[3]);
+	void pack_curve_seg(int idx, float4 woop[3]);
 
 	/* merge instance BVH's */
 	void pack_instances(size_t nodes_size);