* Shrink/Fatten for bevelled curves

This is a much faster and easier way to give a bevelled curve a taper, without
using taper curves. Each point on a curve now has a 'radius' value that you can
shrink and fatten using Alt S, which will influence the taper when the curve is
bevelled (either with a bevob, or with front/back turned off and a bevel dept
set). Alt S shrinks and fattens the selected points in an interactive transform,
and you can set an absolute radius for selected points with 'Set Radius' in the
curve specials menu.

See demo: http://mke3.net/blender/etc/curve_shrinkfatten-h264.mov

This can be a quick way to create revolved surfaces (eg.
http://mke3.net/blender/etc/wineglass-h264.mov ) and it would be very
interesting to use this radius value in other tools, such as a 'freehand curve'
tool that would let you draw a curve freehand, with the radius affected by pen
pressure, or even using the radius at each point to control curve guides for
particles more precisely, rather than the continous maxdist.

1 files changed, 7 insertions, 6 deletions

diff --git a/source/blender/makesdna/DNA_curve_types.h b/source/blender/makesdna/DNA_curve_types.h
index 4d0cca68ad3..04b7b4804b7 100644
--- a/source/blender/makesdna/DNA_curve_types.h
+++ b/source/blender/makesdna/DNA_curve_types.h
@@ -89,7 +89,7 @@ typedef struct BevPoint {
 */
 typedef struct BezTriple {
 	float vec[3][3];
-	float alfa, weight, pad;
+	float alfa, weight, radius;	/* alfa: tilt in 3D View, weight: used for softbody goal weight, radius: for bevel tapering */
 	short h1, h2;
 	char f1, f2, f3, hide;
 } BezTriple;
@@ -97,17 +97,18 @@ typedef struct BezTriple {
 /* note; alfa location in struct is abused by Key system */
 typedef struct BPoint {
 	float vec[4];
-	float alfa, weight;
+	float alfa, weight;		/* alfa: tilt in 3D View, weight: used for softbody goal weight */
 	short f1, hide;
+	float radius, pad;		/* user-set radius per point for bevelling etc */
 } BPoint;
 
 typedef struct Nurb {
-	struct Nurb *next, *prev;
+	struct Nurb *next, *prev;	/* multiple nurbs per curve object are allowed */
 	short type;
-	short mat_nr;          /* index into material list */
+	short mat_nr;		/* index into material list */
 	short hide, flag;
-	short pntsu, pntsv;
-	short resolu, resolv;
+	short pntsu, pntsv;		/* number of points in the U or V directions */
+	short resolu, resolv;	/* tesselation resolution in the U or V directions */
 	short orderu, orderv;
 	short flagu, flagv;