Viewport smoke: add options to draw velocity vectors.

This basically exposes to the UI a function that was only available
through a debug macro ; the purpose is obviously to help debugging
simulations. It adds ways to draw the vectors either as colored needles
or as arrows showing the direction of the vectors. The colors are based
on the magnitude of the underlying vectors.

Reviewers: plasmasolutions, gottfried

Differential Revision: https://developer.blender.org/D1733

1 files changed, 9 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_smoke_types.h b/source/blender/makesdna/DNA_smoke_types.h
index 5526c18f656..ba7f73c2f63 100644
--- a/source/blender/makesdna/DNA_smoke_types.h
+++ b/source/blender/makesdna/DNA_smoke_types.h
@@ -72,6 +72,11 @@ enum {
 	SLICE_AXIS_Z    = 3,
 };
 
+enum {
+	VECTOR_DRAW_NEEDLE     = 0,
+	VECTOR_DRAW_STREAMLINE = 1,
+};
+
 /* cache compression */
 #define SM_CACHE_LIGHT		0
 #define SM_CACHE_HEAVY		1
@@ -184,10 +189,13 @@ typedef struct SmokeDomainSettings {
 
 	/* Display settings */
 	char slice_method, axis_slice_method;
-	char slice_axis, pad2;
+	char slice_axis, draw_velocity;
 	float slice_per_voxel;
 	float slice_depth;
 	float display_thickness;
+	float vector_scale;
+	char vector_draw_type;
+	char pad2[3];
 } SmokeDomainSettings;