Set a named texture.
Many shaders use more than one texture. Use SetTexture to change the propertyName texture.
When setting textures on materials using the Standard Shader, you should be aware that you may need to use EnableKeyword to enable features of the shader that were not previously in use. For more detail, read Accessing Materials via Script.
Common texture names used by Unity's builtin shaders:
"_MainTex" is the main diffuse texture. This can also be accessed via mainTexture property.
"_BumpMap" is the normal map.
"_Cube" is the reflection cubemap.
See Also: mainTexture property, GetTexture, Shader.PropertyToID.