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Blender 5.0 Manual
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Blender 5.0 Manual

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Introduction

Materials, lights and backgrounds are all defined using a network of shading nodes.These nodes output values, vectors, colors and shaders.

Shaders

An important concept to understand when building node setups isthat of theshader socket. The output of all surface andvolume shaders is a shader, describing lighting interaction at the surface or of the volume,rather than the color of the surface.

There are a few types of shaders available as nodes:

BSDF shader

Describe light reflection, refraction and absorption at an object surface.

Emission shader

Describe light emission at an object surface or in a volume.

Volume shader

Describe light scattering inside a volume.

Background shader

Describe light emission from the environment.

Each shader node has a color input, and outputs a shader.These can then be mixed and added together using Mix and Add Shader nodes.No other operations are permitted.The resulting output can then be used by the renderer to compute all light interactions,for direct lighting or global illumination.

Textures

Blender has various built in procedural texture nodes,with texture coordinates and various parameters as input, and a color or value as output.No texture data-blocks are needed; instead node groups can be used for reusing texture setups.

For UV mapping and texture painting in the 3D Viewport, the Image Texture node must be used.When setting such a node as active, it will be displayed in the 3D Viewportwhile usingTexture color mode.This method can be used to preview painted textures while texture painting.

The default texture coordinates for all nodes are Generated coordinates,except for Image textures that use UV coordinates by default.Each node includes some options to modify the texture mapping and resulting color,and these can be edited in the texture properties.

See also

Textures

More

Nodes for geometric data, texture coordinates,layering shaders and non-physically-based tricks can be found in:

Open Shading Language

In Cycles, custom nodes can be written using theOpen Shading Language

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