bartvdbraak/blender
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Fix Trackball view rotation method to allow rotation angles > 180 deg.

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without having to start over.

I patched this into instinctive a long time ago when someone submitted
the math to the mailing list but never got heard.

I hope it's acceptable :)
This commit is contained in:
Alexander Ewering 2004-07-19 11:38:09 +00:00
parent 319527efe4
commit a2474e9a0a
1 changed files with 37 additions and 17 deletions
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54
source/blender/src/view.c
View File

@ -451,10 +451,8 @@ void viewmove(int mode)
if(mode==0) { /* view rotate */
if (U.uiflag & USER_AUTOPERSP) G.vd->persp= 1;
/* if turntable method, we don't change mvalball[0] */
if(U.flag & USER_TRACKBALL) mvalball[0]= mval[0];
if (U.flag & USER_TRACKBALL) mvalball[0]= mval[0];
mvalball[1]= mval[1];
calctrackballvec(&curarea->winrct, mvalball, newvec);
@ -463,25 +461,47 @@ void viewmove(int mode)
si= sqrt(dvec[0]*dvec[0]+ dvec[1]*dvec[1]+ dvec[2]*dvec[2]);
si/= (2.0*TRACKBALLSIZE);
/* is there an acceptable solution? (180 degrees limitor) */
if(si<1.0) {
if (U.flag & USER_TRACKBALL) {
Crossf(q1+1, firstvec, newvec);
Normalise(q1+1);
phi= asin(si);
Normalise(q1+1);
/* Allow for rotation beyond the interval
* [-pi, pi] */
while (si > 1.0)
si -= 2.0;
/* This relation is used instead of
* phi = asin(si) so that the angle
* of rotation is linearly proportional
* to the distance that the mouse is
* dragged. */
phi = si * M_PI / 2.0;
si= sin(phi);
q1[0]= cos(phi);
q1[1]*= si;
q1[2]*= si;
q1[3]*= si;
q1[3]*= si;
QuatMul(G.vd->viewquat, q1, oldquat);
if( (U.flag & USER_TRACKBALL)==0 ) {
} else {
/* is there an acceptable solution? (180 degrees limitor) */
if(si<1.0) {
Crossf(q1+1, firstvec, newvec);
Normalise(q1+1);
phi= asin(si);
si= sin(phi);
q1[0]= cos(phi);
q1[1]*= si;
q1[2]*= si;
q1[3]*= si;
QuatMul(G.vd->viewquat, q1, oldquat);
/* rotate around z-axis (mouse x moves) */
phi= 2*(mval[0]-mvalball[0]);
@ -490,7 +510,7 @@ void viewmove(int mode)
q1[0]= cos(phi);
q1[1]= q1[2]= 0.0;
q1[3]= si;
QuatMul(G.vd->viewquat, G.vd->viewquat, q1);
}
}