Default Shader - Opacity Tab
Description:
The Opacity tab has settings which effect the opacity of the shader. It might help to think of opacity as being the opposite of transparency.
Settings:
- Opacity: This sets the overall opacity of the shader. A value of 1 means the shader is fully opaque. A value of 0 means the image is fully transparent.
- Opacity image: You can use this to select an image file to control opacity.
- Use alpha channel: If this is checked the alpha channel from the specified image file will be used for opacity rather than the colour channels.
- Invert opacity image: If this is checked the opacity image is inverted i.e. black becomes white.
- Opacity function: This parameter lets you control opacity using other nodes.
- Alpha from colour: If this is checked then the shader will generate opacity based on a colour from the image specified in the Colour image parameter and/or the shader connected to the Colour function parameter. The colour used for opacity is set with the Alpha key parameter.
- Alpha key: This sets the colour used to generate opacity. For example if you want green areas to be transparent you would set the alpha key to green.
- Key tolerance: This controls how many shades of colour similar to the Alpha key colour are used to generate opacity.
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