Strand Render Simplification

============================

- Strand render now has options to remove child strands as
  the object's faces becomes smaller, in the Simplification
  particle panel.
- "Reference Size" is the approximate size of the object on
  screen, after which simplification starts.
- "Rate" is how fast strands are removed.
- "Transition" is the percentage of strands being faded out as
  they are removed.

- Another "Viewport" option removes strands on faces that are
  outside of the viewport. "Rate" again controls how fast these
  are removed.

- Strand render in Blender Units now has an adjustable minimum
  width. Below this minimum width, strands start fading out
  instead of getting smaller.

2 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_material_types.h b/source/blender/makesdna/DNA_material_types.h
index 22585e59c7b..f0b06585f27 100644
--- a/source/blender/makesdna/DNA_material_types.h
+++ b/source/blender/makesdna/DNA_material_types.h
@@ -85,6 +85,7 @@ typedef struct Material {
 	short flarec, starc, linec, ringc;
 	float hasize, flaresize, subsize, flareboost;
 	float strand_sta, strand_end, strand_ease, strand_surfnor;
+	float strand_min, strand_pad;
 	char strand_uvname[32];
 	
 	float sbias;			/* shadow bias */
diff --git a/source/blender/makesdna/DNA_particle_types.h b/source/blender/makesdna/DNA_particle_types.h
index a00d7d484d9..942c837df97 100644
--- a/source/blender/makesdna/DNA_particle_types.h
+++ b/source/blender/makesdna/DNA_particle_types.h
@@ -121,6 +121,11 @@ typedef struct ParticleSettings {
 	short bb_align, bb_uv_split, bb_anim, bb_split_offset;
 	float bb_tilt, bb_rand_tilt, bb_offset[2];
 
+	/* simplification */
+	short simplify_flag, simplify_refsize;
+	float simplify_rate, simplify_transition;
+	float simplify_viewport;
+
 	/* general values */
 	float sta, end, lifetime, randlife;
 	float timetweak, jitfac, keyed_time;
@@ -307,6 +312,10 @@ typedef struct ParticleSystem{
 #define PART_DRAW_WHOLE_GR		(1<<14)
 #define PART_DRAW_REN_STRAND	(1<<15)
 
+/* part->simplify_flag */
+#define PART_SIMPLIFY_ENABLE	1
+#define PART_SIMPLIFY_VIEWPORT	2
+
 /* part->bb_align */
 #define PART_BB_X		0
 #define PART_BB_Y		1