animated texture question

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  10 October 2012
animated texture question

Hi Gang,

I am doing an animation of some laser beams cutting out a machined part from an aluminum block (not a real world scenario, its just do something cool). My question is, how would I create the burn marks from the laser as it travels across the surface ( burned edges of the cutting). I'm trying to wrap my head around something like an animated texture reveal or mask reveal but I have no idea how this can be acheived as the path of the laser has a few 90 deg turns. 1 option (would be painstaking) would be to use material ID switcher, but this means I would need a thousand painted frames of a burned line to switch through as the laser moves. Lastly, I could just use morpher to replicate a cut mark as the laser moves - but it wouldn't have the burned edges taking away from the realism.

Any thoughts?
Thanks in advance to anyone who has an idea!
-Dan
 
  10 October 2012
You could have a poly decal strip sitting where your burn is with your burnt texture which is revealed by a ramp shader which you animate to reveal it.
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Matt Rennie
Sr. Character Rigger
Rockstar North
 
  10 October 2012
Thanks Matt,

That could work - what I'm unsure of is the path of the laser and using the gradient to reveal the burn texture - I guess I would not only animate the gradient ramp, but also the rotation of the gradient to follow the 90 deg turns of the laser???

This is a quick mock up of it:
 
  10 October 2012
make your poly completely straight as a long strip. UV it like that with a planar map. Then modify its shape to fit the path you want to cut then you just animate the ramp from o to 1 and it will look like its animating along the length of your modelled decal.
__________________
Matt Rennie
Sr. Character Rigger
Rockstar North
 
  10 October 2012
Yes! Now I understand you. I'm going to shut up now and do another test. Stay tuned!
 
  10 October 2012
Okay, here is the test. So I forgot to turn off shadow casting on the poly strip - will do, I guess I can put it a little closer to the surface of the block as well. Now about the texture itself, since I'm using a gradient ramp to manipulate the opacity of the texture - how can I make a texture that is just the burnt line (so I don't have white background in the map, I would normally use an opacity map to remove the white). I never fully understood the use of Alphas and if they could control the opacity, but how? Can't you save a map with transparent background out of Photoshop to use within Max?

In other words - How do I remove the white part of the map in Max when I've already used a gradient ramp in the opacity slot to control the reveal of the map?

 
  10 October 2012
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