animated texture question

Become a member of the CGSociety

Connect, Share, and Learn with our Large Growing CG Art Community. It's Free!

Thread Tools Search this Thread Display Modes
Old 10 October 2012   #1
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!
Old 10 October 2012   #2
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.
Matt Rennie
Sr. Character Rigger
Rockstar North
Old 10 October 2012   #3
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:
Old 10 October 2012   #4
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
Old 10 October 2012   #5
Yes! Now I understand you. I'm going to shut up now and do another test. Stay tuned!
Old 10 October 2012   #6
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?

Old 10 October 2012   #7
Thread automatically closed

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.
CGTalk Policy/Legalities
Note that as CGTalk Members, you agree to the terms and conditions of using this website.
Thread Closed share thread

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Society of Digital Artists

Powered by vBulletin
Copyright 2000 - 2006,
Jelsoft Enterprises Ltd.
Minimize Ads
Forum Jump

All times are GMT. The time now is 01:05 AM.

Powered by vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.