- added VecLerpf to blenlib

 - switch to using DerivedMesh.drawMappedFaceCentersEM to draw
   face dots, still need to do some work so this works in all
   selection modes (atm it does not work in no-zbuf mode)

2 files changed, 16 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_arithb.h b/source/blender/blenlib/BLI_arithb.h
index 9583f259ab0..901c0c9776a 100644
--- a/source/blender/blenlib/BLI_arithb.h
+++ b/source/blender/blenlib/BLI_arithb.h
@@ -546,6 +546,13 @@ VecAddf(
 	float *v1, 
 	float *v2
 );
+	void
+VecLerpf(
+	float *target, 
+	float *a, 
+	float *b,
+	float t
+);
 	void 
 VecUpMat3(
 	float *vec, 
diff --git a/source/blender/blenlib/intern/arithb.c b/source/blender/blenlib/intern/arithb.c
index 41f52e2455c..e8317383e3f 100644
--- a/source/blender/blenlib/intern/arithb.c
+++ b/source/blender/blenlib/intern/arithb.c
@@ -1790,6 +1790,15 @@ void VecSubf(float *v, float *v1, float *v2)
 	v[2]= v1[2]- v2[2];
 }
 
+void VecLerpf(float *target, float *a, float *b, float t)
+{
+	float s = 1.0f-t;
+
+	target[0]= s*a[0] + t*b[0];
+	target[1]= s*a[1] + t*b[1];
+	target[2]= s*a[2] + t*b[2];
+}
+
 void VecMidf(float *v, float *v1, float *v2)
 {
 	v[0]= 0.5f*(v1[0]+ v2[0]);