Hello, I'm feeling pretty defeated at this point and figured I need to ask for some help. I feel like what I'm trying to do should be very easy and that I'm just making it too difficult. What I'm trying to do is translate and scale a quad about an anchor point. I've managed to get the initial logic working very well for setting the anchor point and scaling around it. I can also translate just fine before or after the first scale. The issue I'm having is when I go to scale a second time around a different anchor point. I can't seem to be able to figure out the proper logic to do this. Here's how I'm computing the quad's matrix for anchored scaling then translation.
Code: osg::Matrix matrix; // 1) Move the matrix to the anchor point matrix *= osg::Matrix::translate(-_anchorPoint); // 2) Multiply the scale matrix at the anchor point matrix *= _scaleMatrix; // 3) Move the matrix back to the origin matrix *= osg::Matrix::translate(_anchorPoint); // 4) Multiply the translation matrix matrix *= _translationMatrix; // 5) Apply the new matrix to the quad setMatrix(matrix); Initially my translation matrix is zero and my scale matrix is set to 1.0 in all directions. This all works great during the first scaling operation. The problem is that once I stop scaling, then change my anchor point, the quad jumps. I'm assuming this is because I'm changing the anchor point and nothing else. I've tried everything from decomposing the current matrix and resetting the anchor point back to 0.0, 0.0 but I can't seem to figure it out. Any help would be greatly appreciated. Thanks! -- Christian ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=56199#56199 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
