Linear (XYZ to UVW) projection is also known as planar or flat mapping. This projection takes the world or object space coordinates and uses them as UVW coordinates. For images, X and Y coordinates are mapped to U and V. Rotating the Z axis rotates the image around the center. This projection maps image textures to the (-1, -1) - (1, 1) range.
Transform - The transformation applied to the projection. Accepts a Transform node.
Coordinate Space - The coordinate space used by the projection.