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Projection Texture Painting
Projection texture painting allows an artist to paint on texture mapped on a 3D model. Contrary to painting in the image editor, projection texture painting is done in the 3D viewport of blender.
To enter texture paint mode, you need to select a mesh object and select Texture Paint from the mode menu, through which Object, Edit etc modes are toggled from.
Painting on a 3D model requires some setup before being possible. Blender needs a way to map an image to the 3D model. This is accomplished by using a UV layer, (See UV Mapping for more details) so if the model hasn't been unwrapped yet, it should be unwrapped prior to entering Texture Paint mode. The image assigned to the UV layer is also used for painting. That means that the user should either:
- unwrap the model while the target image is displayed in the image editor, or
- unwrap and while still in edit mode, change the image of the UV editor to the target image.
If the target image is not square the first method is preferable, so that unwrapping accounts for the aspect ratio of the image.