Various Transform bugfixes.

- Trackball rotate was missing the NoConstraints flag
- Zooming didn't recalculate the 2D center correctly
- Zooming in transform was sending event to the 3D window even when working on UVs. (disabled when working on UVs for now, will need to send events to a 2D window handler eventually)
- In camera mode, when the selection was exactly on the camera, initgrabz was barfing, fallback to 1.0 now, which gives ok results.

source/blender/include/transform.h

@@ -338,6 +338,7 @@ void restoreTransObjects(TransInfo *t);
 void recalcData(TransInfo *t);
 
 void calculateCenter(TransInfo *t);
+void calculateCenter2D(TransInfo *t);
 void calculateCenterBound(TransInfo *t);
 void calculateCenterMedian(TransInfo *t);
 void calculateCenterCursor(TransInfo *t);

source/blender/src/transform.c

@@ -194,6 +194,9 @@ void setTransformViewMatrices(TransInfo *t)
 		Mat4One(t->persinv);
 		t->persp = 0; // ortho
 	}
+	
+	calculateCenter2D(t);
+	
 }
 
 void convertViewVec(TransInfo *t, float *vec, short dx, short dy)
@@ -334,6 +337,12 @@ static void view_editmove(unsigned short event)
 	/* Alt-Shift: Rotate up */
 	/* Alt-Ctrl:  Rotate right */
 	
+	/* only work in 3D window for now
+	 * In the end, will have to send to event to a 2D window handler instead
+	 */
+	if (Trans.flag & T_2D_EDIT)
+		return;
+	
 	switch(event) {
 		case WHEELUPMOUSE:
 			
@@ -1792,6 +1801,8 @@ void initTrackball(TransInfo *t)
 	t->snap[2] = t->snap[1] * 0.2f;
 	t->fac = 0;
 	t->transform = Trackball;
+	
+	t->flag |= T_NO_CONSTRAINT; /* making sure the flag is always set */
 }
 
 static void applyTrackball(TransInfo *t, float axis1[3], float axis2[3], float angles[2])

source/blender/src/transform_generics.c

@@ -557,23 +557,12 @@ void restoreTransObjects(TransInfo *t)
 	recalcData(t);
 }
 
-void calculateCenterCursor(TransInfo *t)
+void calculateCenter2D(TransInfo *t)
 {
-	float *cursor;
-
-	cursor = give_cursor();
-	VECCOPY(t->center, cursor);
-
 	if (t->flag & (T_EDIT|T_POSE)) {
 		Object *ob= G.obedit?G.obedit:t->poseobj;
-		float mat[3][3], imat[3][3];
 		float vec[3];
 		
-		VecSubf(t->center, t->center, ob->obmat[3]);
-		Mat3CpyMat4(mat, ob->obmat);
-		Mat3Inv(imat, mat);
-		Mat3MulVecfl(imat, t->center);
-		
 		VECCOPY(vec, t->center);
 		Mat4MulVecfl(ob->obmat, vec);
 		projectIntView(t, vec, t->center2d);
@@ -583,6 +572,27 @@ void calculateCenterCursor(TransInfo *t)
 	}
 }
 
+void calculateCenterCursor(TransInfo *t)
+{
+	float *cursor;
+
+	cursor = give_cursor();
+	VECCOPY(t->center, cursor);
+
+	/* If edit or pose mode, move cursor in local space */
+	if(t->flag & (T_EDIT|T_POSE)) {
+		Object *ob= G.obedit?G.obedit:t->poseobj;
+		float mat[3][3], imat[3][3];
+		
+		VecSubf(t->center, t->center, ob->obmat[3]);
+		Mat3CpyMat4(mat, ob->obmat);
+		Mat3Inv(imat, mat);
+		Mat3MulVecfl(imat, t->center);
+	}
+	
+	calculateCenter2D(t);
+}
+
 void calculateCenterMedian(TransInfo *t)
 {
 	float partial[3] = {0.0f, 0.0f, 0.0f};
@@ -602,17 +612,7 @@ void calculateCenterMedian(TransInfo *t)
 	VecMulf(partial, 1.0f / i);
 	VECCOPY(t->center, partial);
 
-	if (t->flag & (T_EDIT|T_POSE)) {
-		Object *ob= G.obedit?G.obedit:t->poseobj;
-		float vec[3];
-		
-		VECCOPY(vec, t->center);
-		Mat4MulVecfl(ob->obmat, vec);
-		projectIntView(t, vec, t->center2d);
-	}
-	else {
-		projectIntView(t, t->center, t->center2d);
-	}
+	calculateCenter2D(t);
 }
 
 void calculateCenterBound(TransInfo *t)
@@ -641,17 +641,7 @@ void calculateCenterBound(TransInfo *t)
 	VecAddf(t->center, min, max);
 	VecMulf(t->center, 0.5);
 
-	if (t->flag & (T_EDIT|T_POSE)) {
-		Object *ob= G.obedit?G.obedit:t->poseobj;
-		float vec[3];
-		
-		VECCOPY(vec, t->center);
-		Mat4MulVecfl(ob->obmat, vec);
-		projectIntView(t, vec, t->center2d);
-	}
-	else {
-		projectIntView(t, t->center, t->center2d);
-	}
+	calculateCenter2D(t);
 }
 
 void calculateCenter(TransInfo *t) 

source/blender/src/view.c

@@ -145,24 +145,18 @@ void initgrabz(float x, float y, float z)
 {
 	if(G.vd==0) return;
 	zfac= G.vd->persmat[0][3]*x+ G.vd->persmat[1][3]*y+ G.vd->persmat[2][3]*z+ G.vd->persmat[3][3];
+	
+	/* if x,y,z is exactly the viewport offset, zfac is 0 and we don't want that */
+	if (zfac==0.0f) zfac = 1.0f;
 }
 
 void window_to_3d(float *vec, short mx, short my)
 {
 	/* always call initzgrab */
 	float dx, dy;
-	float fmx, fmy, winx, winy;
 
-	/* stupid! */
-	winx= curarea->winx;
-	winy= curarea->winy;
-	fmx= mx;
-	fmy= my;
-	
-	dx= (2.0*fmx)/winx;
-	dx*= zfac;
-	dy= (2.0*fmy)/winy;
-	dy*= zfac;
+	dx= 2.0f*mx*zfac/curarea->winx;
+	dy= 2.0f*my*zfac/curarea->winy;
 
 	vec[0]= (G.vd->persinv[0][0]*dx + G.vd->persinv[1][0]*dy);
 	vec[1]= (G.vd->persinv[0][1]*dx + G.vd->persinv[1][1]*dy);