07fc95ca9a
Orthographic cameras are specified by setting the `orthographic` attribute of the `<camera>` element. The `fovy` attribute is still used to specify the field-of-view, but its semantic is different for orthographic cameras. For orthographic cameras, the field-of-view is expressed in units of length, rather than degrees. Other related changes: * Fix bug in the ordering of `cam_xxx` elements in `mjModel`. * Make camera visualization translucent only when the frustum is visualized. * Added a button to `simulate` to toggle between perspective and orthographic free cameras. https://youtu.be/ZXBTEIDWHhs PiperOrigin-RevId: 642293435 Change-Id: Id090a421ad88ab404b5b27ddbbd6bfc81ad49bc5