[Bf-blender-cvs] SVN commit: /data/svn/bf-blender [14311] trunk/blender/source/blender/ blenlib/intern/arithb.c:

[Brecht Van Lommel]

Revision: 14311
          
http://projects.blender.org/plugins/scmsvn/viewcvs.php?view=rev&root=bf-blender&revision=14311
Author:   blendix
Date:     2008-04-01 23:16:24 +0200 (Tue, 01 Apr 2008)

Log Message:
-----------

Fix for bug #7368: flipping issue with dual quaternions and scaled bones.

Modified Paths:
--------------
    trunk/blender/source/blender/blenlib/intern/arithb.c

Modified: trunk/blender/source/blender/blenlib/intern/arithb.c
===================================================================
--- trunk/blender/source/blender/blenlib/intern/arithb.c        2008-04-01 
21:09:50 UTC (rev 14310)
+++ trunk/blender/source/blender/blenlib/intern/arithb.c        2008-04-01 
21:16:24 UTC (rev 14311)
@@ -1727,9 +1727,13 @@
 
 void DQuatAddWeighted(DualQuat *dqsum, DualQuat *dq, float weight)
 {
+       int flipped= 0;
+
        /* make sure we interpolate quats in the right direction */
-       if (QuatDot(dq->quat, dqsum->quat) < 0)
-               weight = -weight;
+       if (QuatDot(dq->quat, dqsum->quat) < 0) {
+               flipped= 1;
+               weight= -weight;
+       }
 
        /* interpolate rotation and translation */
        dqsum->quat[0] += weight*dq->quat[0];
@@ -1746,6 +1750,9 @@
        if (dq->scale_weight) {
                float wmat[4][4];
 
+               if(flipped)     /* we don't want negative weights for scaling */
+                       weight= -weight;
+
                Mat4CpyMat4(wmat, dq->scale);
                Mat4MulFloat((float*)wmat, weight);
                Mat4AddMat4(dqsum->scale, dqsum->scale, wmat);


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