Draw actual hair keys when the "Guide Hair" setting is enabled.

Without this certain debug tasks become very hard to visualize.

1 files changed, 28 insertions, 0 deletions

diff --git a/source/blender/editors/space_view3d/drawobject.c b/source/blender/editors/space_view3d/drawobject.c
index 4b566b6f519..da075419890 100644
--- a/source/blender/editors/space_view3d/drawobject.c
+++ b/source/blender/editors/space_view3d/drawobject.c
@@ -5162,10 +5162,13 @@ static void draw_new_particle_system(Scene *scene, View3D *v3d, RegionView3D *rv
 
 		if (part->type ==  PART_HAIR) {
 			if (part->draw & PART_DRAW_GUIDE_HAIRS) {
+				DerivedMesh *hair_dm = psys->hair_out_dm;
+				
 				glDisable(GL_LIGHTING);
 				glDisable(GL_COLOR_MATERIAL);
 				glDisableClientState(GL_NORMAL_ARRAY);
 				glDisableClientState(GL_COLOR_ARRAY);
+				
 				for (a = 0, pa = psys->particles; a < totpart; a++, pa++) {
 					if (pa->totkey > 1) {
 						HairKey *hkey = pa->hair;
@@ -5179,6 +5182,31 @@ static void draw_new_particle_system(Scene *scene, View3D *v3d, RegionView3D *rv
 						glDrawArrays(GL_LINE_STRIP, 0, pa->totkey);
 					}
 				}
+				
+				if (hair_dm) {
+					MVert *mvert = hair_dm->getVertArray(hair_dm);
+					int i;
+					
+					glColor3f(0.9f, 0.4f, 0.4f);
+					
+					glBegin(GL_LINES);
+					for (a = 0, pa = psys->particles; a < totpart; a++, pa++) {
+						for (i = 1; i < pa->totkey; ++i) {
+							float v1[3], v2[3];
+							
+							copy_v3_v3(v1, mvert[pa->hair_index + i - 1].co);
+							copy_v3_v3(v2, mvert[pa->hair_index + i].co);
+							
+							mul_m4_v3(ob->obmat, v1);
+							mul_m4_v3(ob->obmat, v2);
+							
+							glVertex3fv(v1);
+							glVertex3fv(v2);
+						}
+					}
+					glEnd();
+				}
+				
 				glEnable(GL_LIGHTING);
 				glEnable(GL_COLOR_MATERIAL);
 				glEnableClientState(GL_NORMAL_ARRAY);