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SWEEP NURBS – Editable? (clip included)
Hello the COW! 2 QUESTIONS:
I’m extruding a star along a spline with a SWEEP NURB. (samples below)
1 – Is there a way to have the face of the star be a different color than the extrusion that trails it? I’m aware that you can ‘make editable’, and then apply different materials to the face and the extrusion, but this doesn’t help me. When I make the SWEEP editable, I lose my animation controls, growth, scale, etc.
2 – Is there a way to track the face of the star? The reason being, I’d like to bring the star to After Effects, and play a video clip inside the face of it.
image (Save File As)
movie (Save File As)
C4D file (Save File As)Any feedback welcome!
Thanks!
Jason -
3 Replies
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1. Yes, there are hidden selection on any nurb with caps C1, and C2 for the caps and R1 and R2 for the fillets (roundings). Just put the material you want on the face on the Sweep and type C1 or C2 (whichever is right) in the material tags Selection box.
2. point the camera at the face? You could move a null along the spline (using align to spline) you are sweeping along (at the same speed as the sweep is growing) and align the camera to that.
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As far as the tracking, if I understand you correctly, you want a different color for the cap, but you also want it to show video inside it at some point that is also locked to the cap? Well you could render the cap in 2 passes. One pass with just the color cap and another pass with the video mapped to the cap. Then in after effects, just do a dissolve (or whatever transition) to the video render.
If you really want to ‘track’ it as in motion track, assuming your star cap is always in the same perspective, you can make a quick texture (like say a circlular grad) that makes a small white dot on the cap to motion track in AE, but this seems like a sloppy workaround.
Chris Smith
https://www.sugarfilmproduction.com -
Chris & Brian-
Thanks for your notes! They’ve been very helpful!
OK, I’ve been able to isolate the three parameters of the star with three different colors. (see sample clip below). However, I’m having trouble isolating the green star face as its own pass to take to After Effects for LUMA keys. I’ve attached an object buffer to my SWEEPS NURB (see sample image below), but as expected, the OBJ BUF isolates the whole RGB image. In the render setteings, I’ve tried all of the options available: illumination, material color, etc., but I don’t know if that’s the right method. Is there a tag I need to attach to the material somewhere?
Many thanks in advance!
Jason
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