I got stuck at the following problem, which I believe shall be easy. I need a Curve Line to have its normal to point to the camera (so that when I use the Curve Line as a profile to curve to mesh, the geometry will be facing the camera as if it was flat). And I have not found a way to actually do this!
I also tested creating a line, that connects the camera with the center of a bounding box of the curve object, which will turn into a mesh, using the Curve Line as a profile, but also there I got stuck, unable to copy its vector to adjust the Curve Line’s rotation.
I want to use this to generate flat geometry (animation trails) that will have its faces oriented to the camera at any time.
Arctan2 - you give it rise and run and it gives back the angle in range -π to π… preferable to Arcsine and Arccosine since those only work in the range -π/2 to π/2.
Yeah, just remember that crossing the tangent with the normal gives the local “up” vector and those 3 vectors (normal, tangent and up) are all orthogonal and define the basis coordinate frame for any given point on a curve… and a lot of things should make more sense.
I copied your example and it’s not working yet, but I will take it slowly step by step and try to visualise the calculations to see where it’s going wrong. Right now, it’s actually breaking the profile line as if it had three vertices, while it still has just two…
