Billboard dynamic size mode?

Jul 17, 2013 at 6:07 AM
First of all, awesome framework. This is all stuff I wish had been included in WPF. Has anyone come up with an easy way to make a billboard scale in size as the camera moves? (i.e. it still always faces the camera, just that it would grow smaller/larger along with the models around it).
Coordinator
Aug 8, 2013 at 3:57 PM
You find the calculation in BillboardGeometryBuilder.GetPositions.
I think you don't need to transform to/from screen space, so this case will be easier.
Use the camera up direction and look direction to find "up" and "right" vectors for the billboard rectangle. Then scale the unit normals by desired width/height in your world space.
Apr 15, 2014 at 7:45 AM
Robzhu, did you ever get this working as I am struggling with the same task? If so, what is the trick? Or has anyone any additional help they can post.
Coordinator
Apr 29, 2014 at 9:28 AM
We should create an example. I added https://helixtoolkit.codeplex.com/workitem/10040
Aug 15, 2014 at 5:05 PM
Did someone resolved this problem? PhilDotC, robzhu? I'm trying to do this for weeks, but I can't understand the calculations inside GetPositions.