I could probably do the following easily-enough with a task–and I suspect that that’s what I’ll end up doing–but it seems like something that might be better handled by a RenderEffect, if one is available. I don’t see a way of doing so right now–but it seems worth asking, in case I’m missing something:
So, is there a way to create a RenderEffect/set of RenderEffects (or similar such control) that tips a model towards the camera?
Let me explain what I mean: Imagine that you have a quad, with its surface facing along the up-axis–like a playing-card lying on a table. What I want, then, is for the quad to rotate around the vector perpendicular to the vector between the camera and the card–thus tipping it to face towards the camera. However, I want it to do this without rotating around its vertical axis.
Put another way, an axial billboard only rotates around its vertical axis; I want a billboard that rotates around any axis but its vertical.
Is there some way that I might do that with RenderEffects/other such things? None of the BillboardEffects seem to do it (although I may well be misunderstanding the “point-world” version). Perhaps some cunning use of a CompassEffect…?