Texture Painting - Blender Master Class: A Hands-on Guide to Modeling, Sculpting, Materials, and Rendering - page 175

a mask layer for cloning a mossy texture over a rock
texture, as follows:

Object Data tab of the Properties editor. Then,
assign a different rock texture to the Cube
UV set, but this time use a moss-covered rock
texture.

1. Duplicate the original UV map twice by click-

ing the + icon in the UV Coordinates panel of
the Object Data tab in the Properties editor.
Rename each set so that you'll know which is
which. As the names for my sets, I chose Paint
for my final painted texture, Mask for my mask
image, and Cube . I would use the Cube UV set
for projecting my seamless textures, so I re-
unwrapped the statue in Edit mode using the
Cube Project option to give an unwrap with
nice consistency between parts of the model.

4. Now return to texture painting on the Paint

layer (again selecting it in the Properties editor
to make it the active UV set). Switch on Stencil
in the Project Paint panel, choosing your mask
UV set from the drop-down menu beside it.
Then, with the Clone brush, paint the second
rock texture over the original one. The effect
of the brush is automatically masked according
to the ambient occlusion map, allowing you to
easily paint only on the exposed areas, as shown
in Figure 11-27.

2. Assign your seamless rock texture to the Cube

UV set, scaling it to suit the details in the rock.
Then, switch to your Paint UV set and use the
Clone tool (make sure Clone is turned on in the
Project Paint panel) to clone the rock texture
from the Cube project UV set to the painted
texture.

After saving the resulting image as a .tga file, I
used the ambient occlusion map in GIMP to lighten
the exposed areas of the texture by opening the
painted texture and adding the ambient occlusion
map over the top (using Open as Layer). Setting the
ambient occlusion map's blend mode to Overlay and
reducing its opacity subtly lightened the exposed
areas of the statue and darkened the crevices, as
shown in Figure 11-28.

3. To mix in the second texture, use the Project

Paint Stencil option. Switch to Edit mode and
assign your ambient occlusion map to the Mask
UV set by selecting the Mask UV set in the

Stencil UV set
(for Masking)

Clone UV set

Figure 11-27: Using the Project Paint Mask setting to mask the effect of the Clone brush allowed
me to mix textures according to an ambient occlusion map.