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View Full Version : Blender Vs. Lightwave



scorpius
01-04-2004, 12:29 PM
I posted this on cgtalk, and thought you guys might also find it interesting.

My intent is not to start a flame war, but to illustrate the different ways Blender and Lightwave calculate global illumination. Blender uses the Finite Element method and LW uses Monte Carlo.

Here are some of my ancient radiosity solutions which I exported from Blender directly to lwo format via my custom python script.

LW_cornell_golf.png (http://ourworld.compuserve.com/homepages/scorpius/misc/LW_cornell_golf.png) and LW_cornell_box.png (http://ourworld.compuserve.com/homepages/scorpius/misc/LW_cornell_box.png).

As you can see this is nothing more than a few simple meshes with vertex colors. Rendering this mesh in LW will provide nice anti-aliasing, specular highlights on the dimples, and a very subtle/interesting checkerboard pattern that has been built into the demo. :(

I'll probably put the lwo on my site if someone wants to take a look. I also included a custom ICON chunk in the lwo file, but the 7.5 demo just displays a question mark. Strange.

Anyway, this is just another old way to get a cool render without using layout, althought it does produce very large files (due to Blender's adaptive subdivision) and slows down the display. I hope I haven't bored anyone. Any thoughts?

bloontz
01-04-2004, 12:48 PM
Very interesting! I would like to look at the file. The experiments on your site are all interesting, though the thumbnails won't zoom for me.

scorpius
01-04-2004, 06:52 PM
Here are some sample LWO files (lwo-vertex-colors.zip (http://ourworld.compuserve.com/homepages/scorpius/misc/lwo-vertex-colors.zip)) that were exported from Blender. Some have the vertex colors stored per-vertex in the VMAP chunk, some have them stored per-face in VMAD.

All of these files include the following chunks: ICON, TEXT, and DESC. The 7.5 demo displays a question mark instead of the icon. And there seems to be no way to access the TEXT and DESC chunks. If anyone knows how to do this, please let me know. Note how the objects are placed on separate layers, and how the layer name is set to the object name.

bloontz, the thumbnails won't zoom? You mean you clicked on one and a larger image doesn't pop up?

bloontz
01-04-2004, 07:52 PM
Thanks, those are surprisingly good looking for vertex maps. I suppose the poly count would be prohibitive on larger scenes. Sorry, I don't know anything about the chunks you mentioned, perhaps they are placeholders for future implementations?

I would like to thank you for your Wings plugins, I've used them alot, they are great!

I went back to your site and tried the thumbnails again and this time they did work. Not sure why they didn't before...

Have you tried this program-

http://www.cs.ubc.ca/nest/imager/contributions/scharein/KnotPlot.html

Someone pointed it out the other day and it's really nice. You can export the knots in a few formats for use in other apps.

scorpius
01-05-2004, 01:31 PM
Yes, I've seen KnotPlot before -- it's cool.

Thanks for using my plugins. I'm glad you find them useful.