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View Full Version : How do I make a Volumetric conform to a shape?



CrazyGuy
10-09-2008, 02:58 AM
Hello,

I can create a volumetric light, but I'd like to contain that volumetric texture to a particular shape, rather than it coming from a light.

Is there a way to make a volumetric object? Can I use a polygonal object to contain the shape of a volumetric texture?

meshpig
10-09-2008, 03:43 AM
Where's Australia again?

- Have you tried it the other way around using shapes as volumetric lights? As in light an exclusive object with transparency, luminosity and translucency etc?

m

CrazyGuy
10-09-2008, 06:42 PM
Hi Meshpig,

I want to make a volumetric shape, rather than texture polygons. There's a difference, especially when the object is rotated, where a volumetric shape will reveal it's inner substance.

I found that I can add the Hypervoxel plug-in to an object, and volumetric particles appear on the vertices of the object. This is getting close.

Imagine you could create a volumetric shape, like a cloudy texture, but made it in the shape of a human. How could you do that with true 3D volumetrics?

meshpig
10-10-2008, 01:02 AM
Imagine you could create a volumetric shape, like a cloudy texture, but made it in the shape of a human. How could you do that with true 3D volumetrics?

CrazyG

OK, I can imagine but how do you mean "true 3D volumetrics"? Voxels (volumetric pixels) only appear to have "volume". A shape is defined by Geometry, even metaballs.

m

Korvar
10-10-2008, 04:38 AM
Create your shape in polygons.

Random Pricks (ooh-er!) on the surface to give the basic form.

Random points inside the object itself for internal volumetrics.

CrazyGuy
10-13-2008, 02:32 PM
Thanks, Meshpig and Korvar for answering. I will try using a cloud of points to form the shape.

If it is not possible to control the shape of a single Hypervoxel, then maybe that is a feature that Newtek should develop.

ercaxus
10-13-2008, 03:09 PM
I think ogo_taiki had an option like that. You chose an object and the cloud looks like that object. If a great magician created a volumetric plugin that could limit the volumetric to the polygon walls it would be nice.

Maybe it's possible to make a preocedural that shows up in hypervoxels and accepts an object to limit the size of the voxel?(o great dpont hear our prayers)

CrazyGuy
10-14-2008, 04:33 PM
Thanks for that information, 'ercaxus'. I just Googled, and the ogo_taiki does create volumetric shapes.

Website is here:
http://www.asahi-net.or.jp/~pq1a-ogs/sss_e.html
Scroll to near the bottom of the page for examples of volumetric textures. I don't think I can do that in Lightwave without a plug-in.

A couple of images from that website:
http://www.asahi-net.or.jp/~pq1a-ogs/volumetric1.jpg
http://www.asahi-net.or.jp/~pq1a-ogs/volumetric2.jpg