Default Shader - Images Tab
The Images tab has settings relating to the various images used by different aspects of the shader.
Image projection: This popup lets you choose how images are projected or applied by the shader. All of the images used by the shader are projected according to this parameter. It has these options:
- Plan Y (edges = XZ): The images are projected vertically along the Y axis.
Side X (edges = YZ): The images are projected horizontally along the X axis.
Side Z (edges = XY): The images are projected horizontally along the Z axis.
Through camera: The image is projected through the camera specified in the Projection camera parameter.
Object UV (if available): The image is mapped using object UV coordinates, if they're available.
Projection camera: This parameter specifies the camera used for Through camera image projection. If no camera is specified the camera rendering the scene is used.
Unpremultiply specular roughness:
All of the above checkboxes apply to the corresponding image parameter. For example the Unpremultiply colour checkbox applies to the diffuse Colour image parameter. If a checkbox is checked then the appropriate image is unpremultiplied. Some images use premultiplied alpha and may give incorrect results if they're not unpremultiplied. If you know an image doesn't have an alpha channel you don't need to make any changes.
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A shader is a program or set of instructions used in 3D computer graphics to determine the final surface properties of an object or image. This can include arbitrarily complex descriptions of light absorption and diffusion, texture mapping, reflection and refraction, shadowing, surface displacement and post-processing effects. In Terragen 2 shaders are used to construct and modify almost every element of a scene.
A parameter is an individual setting in a node parameter view which controls some aspect of the node.