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Mobile Java 3D Tips, Tricks & Code
 
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February 2005
Transparency using Mascot Capsule Micro3D v3 API

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The Mascot Capsule Micro3D v3 API's support masking of colors and four modes of blending.

When blending colors, the RGB values from the background are individually mixed with the RGB colors from the texture. Note that Half, Addition, and Subtract modes cannot be used at the same time for the same polygon.

The following table shows how the colors are mixed together.

Attribute   Background   Texture  
Normal 0 % + 100 %
Half 50 % + 50 %
Add 100 % + 100 %
Sub 100 % - 100 %

 
Use one of the following commands to perform blending:
 
Graphics3D.PATTR_BLEND_NORMAL
Graphics3D.PATTR_BLEND_HALF
Graphics3D.PATTR_BLEND_ADD
Graphics3D.PATTR_BLEND_SUB
 
// example command
private final int COMMAND = Graphics3D.PDATA_NORMAL_NONE |
Graphics3D.PDATA_TEXURE_COORD |
                              Graphics3D.PRIMITVE_QUADS |
                              Graphics3D.PATTR_BLEND_HALF;
 
Do not forget setting the effect to use transparency:
effect.setTransparency(true);
 
Masking is just as simple. Just use the command Graphics3D.PATTR_COLORKEY, with an index value of zero in the palette used for the image, to mask out the first color.
 
When masking colors, you don't have to set the effect to use transparency.
 
The Ghost images below show the difference when using 1) Normal, 2) PATTR_COLORKEY and 3) PATTR_BLEND_HALF | PATTR_COLORKEY.
 
 
Normal
(no blending)		 Using
color key		 Using blend
half and color key
 
 
 
 
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