generate hole texture @ particle hit?

[poppy]

Hi, another question for lovely community

Say, I have a gun firing at a textured grid. Then I created a small circular texture of bullet hole. How can I stamp the bullet hole texture onto the surface when the particle hit, then write the generated texture into a file for later use?

thanks!

[mdunkley]

Hey, just saw this vid from Peter Bowmar - the capture cuts out a bit but its probably still a good way to go:

Also worth taking a look at Peter Quint's videos on point clouds:

http://vimeo.com/9109254

I'm guessing that first vid is gonna be your easiest bet overall, but the second will probably be better for writing to a file. The basic mantra node has an option to render a specific object in UV space (properties->render->uv render object). So you would probably set up a constant shader with point clouds (i say constant so you're not also baking the lighting), then render that object with the shader on it in uv space to create your texture.

Hope that helps!

[smaugthewyrm]

that exact effect is detailed in the cg-masters lesson "Intro to Visual Effects".

peter bowmar does the lesson and it is excellent.

[poppy]

Thanks!

I'll have a look.

[chaindriver]

I have a similar problem too, but I need to stamp textures, like what Poppy was asking. From the "trailer" video of Peter Bowmar's lesson, it seems like he is using geometry to achieve the effect instead?

I'm thinking of doing something like:

1) Use Ray SOP to project point onto surface

2) Find out UV of the projected point of the surface

3) Layer a predefined texture onto the surface, centered at that UV coordinates

I'm not sure how to do (2) and (3). Does anyone have any ideas?