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Per-Vertex Alpha Paint

Posted on 2007-12-06
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Last Modified: 2013-12-04
In 3DS Max 9.0, I'm trying to set the colour and alpha value of each vertex in a simple plane so that I can create an alpha gradient. I found how to set each colour but am having problems setting the alpha channel.
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Question by:BOINGED
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Author Comment

by:BOINGED
ID: 20442227
Is this even possible?
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by:patrvic
ID: 20454779
i'd like to know that too actually
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Expert Comment

by:patrvic
ID: 20503473
I did not notice that the first comment was by you...i don't think there is such a thing as setting or simply put,  manipulating vertex colors in Max. They change from yellow to red when you select them after a geometry is converted to a mesh.

If you are saying display vertices on a plane, you might want to use a dotted map on the plane.

I hope that answers your question.
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Author Comment

by:BOINGED
ID: 20536530
I found this with a google search  www.synergy-learning.com/products/samples/3ds8m/pdf/VertPainMod.pdf

It is possible to change vertex colours, for example to make a gradient fill across a cube. What I want is an alpha-gradient without using a texture. The article I linked touches upon alpha but doesn't do exactly what I want.
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Expert Comment

by:patrvic
ID: 20548379
From what I infer it talks about the vertextpaint modifier which is doing the job of painting sides starting from a particular  vertex.

As far your question goes you were asking about manipulating colors and alpha for each vertex. Which i still maintain to be a non-existent argument.

if i'm not getting your question correctly, i'm sorry about it.
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faz0222 earned 300 total points
ID: 20821609
Once you have some vertex setup with alpha (edit poly > Vertex alpha settings) do this
- Utilities > Channel Info
- Select the "-2:Alpha" channel and click Copy and then click Add to create a new channel
- Select the new channel at the bottom and click Paste, give a name to your alpha channel (Note that your new channel should be channel 2 but any number is fine)
- Open Material Editor, select a new standard material and apply it to you model
- In the opacity channel apply a "Vertex color" Material
- Inside the Vertex color material select your channel 2 (or any other channel number you have created)
You are done ;) do some render test
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Author Comment

by:BOINGED
ID: 20873637
That's great - will look at it today hopefully.
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