Maps, Alpha Channel, & Opacity!!

[Clementv]

Hi all

I'm trying to create a simple visualisation in viz R3, but i'm can't seem to be able to create 2D planes mapped with cut outs of trees and people that have no background colour.
I begin by creating a plane and assigning the bitmap (Tree.TIFF) as a diffuse map. When i render my scene the bitmap appears, but how do I get rid of the background? I have tried to copy the tree map as an opacity map and then amend Channel & Alpha settings under Bitmap Parameters,
but nothing seems to remove the background.

Any ideas?

[CADTutor]

My first thought is... Er, use Bryce, this sort of thing is much easier :)

Second, I found this great tutorial on creating trees in VIZ 3 http://www.vizdepot.com/tutorials-m4.html maybe that will help. There's loads of other tutorials on thsi site as well. All of them good http://www.vizdepot.com

Then I found this which I think is just what you're after http://www.stclairc.on.ca/people/pages/fperissi/arc404/week9/week9.html

Why not post an image of your finished work so we can all take a look.

[Clementv]

Unfortunately, Bryce is not an option for this work...
I managed to get some OK results by constructing a cruciform from two planes and applying the image to each plane (diffuse colour map) then applying the mask / cut-out of the tree as an opacity map to the same planes.

I would post an image, but I'm not sure how to do this! :oops:

[CADTutor]

To post an image you must first upload it to some webspace. You can get good free webspace here http://www.netfirms.com Once there, you can simply link to the image using the BB Code.