Using texture for dynamic extrusion

[misterbil]

Hi,

I looked around for a while about this. But can't seem to figure this out.

my my goal:

-I'm trying to have a geometry extrude based on a monochromatic textures.

-then animate the texture (uv scrolling or procedural) and have the extrusion follow.

This guy did a fantastic job of what I'm trying to do:

example:

from Manuel Tausch on vimeo :https://vimeo.com/8309528

I think I have the extrusion part. Right now it's on a grid and don't look the way I want on a sphere but I'll try to figure that out later.

My main issue is that my animated texture... well, don't animate.

here is the texture I'm using:

I know it doesn't tile but it's just for testing.

I have a cop network (where I do the animation) in my sop and I call that in my extrusion.

any help would be greatly appreciate.

thanks.

bil

procedural_extrusion.hipnc

[dennis.albus]

Hey Bil,

I've changed your file a little bit. That's how I would do it. I know I used more nodes, but I like the flexibility of VOPS. Not sure if its faster or slower.

The important part to note here is the op syntax which is as follows:

op:/img/comp1/OUT[$F][/CODE]

Credit goes to Macha from this thread:

http://forums.odforc...e-on-an-object/

Adding [$F] ensures proper updates of the texture.

-dennis

procedural_extrusion.hipnc

Edited April 10, 2013 by dennis.weil

[misterbil]

Thanks Dennis,

but I get the same problem that the other guy in the threat had... adding the [$F] doesn't seems to work for me

Did it work for you? did the extrusion get animated?

after adding the [$F] the expression seems to error out...

my string look like that:

op:/obj/sphere_object/cop2net1/MAP_OUT[$F]

wondering if I'll have to bake the texture as well.

bil

[rafaelfs]

Here it animates the extrusion but only after frame 57... must be a bug.

Cheers

[misterbil]

Hi Rafael,

thanks for trying it out, did you use my original scene? or the one Dennis edited?

cheers

b

[dennis.albus]

You are right, it's not very consistent. Sometimes it works, sometimes it doesn't. Seems to be a caching problem in COPs because it does not update if I change the image.

I will try to get to the bottom of the problem and file a bug if neccesary.

-dennis

[petz]

putting [$F] after op:path forces houdini to cache the images per frame. so, if you change something in cops you won´t see any updates in the viewport since the sequence is already cached. you have to use texcache -c or override the numbers of images which should be stored with texcache -n.

or you could use a callback that clears the cache always at frame 1.

petz

procedural_extrusion1.hipnc

[misterbil]

Thanks a million, Petz!

It works fantastically!

I was guessing it had to do with caching something, but this makes a lot of sense!

houdini for the win!

b