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By default, the three ‘walls’ forming the axes of the 3D charts are shaded in patterns 3,2,1 for the left wall (yz-plane), back wall (xz-plane) and floor (xy-plane) respectively. This gives an illusion of lighting from the usual upper-left corner. However it is possible to use your choice of pattern here, for example:
ch.Set 'Walls' 24 30 28
ch.Set 'Walls' 'Bricks,Basket,Solid
Note that you can give pattern names or numeric values here. These should be in the range 0-39 to select from the standard patterns, or numbers above 40 which are the ids of custom tiles or gradient fills. Linear gradients can be used to good effect here with SVG and VML output – patterns 24,30,28 shade diagonally into the back corner when used together.
This could also be used (typically with VML) to apply a bitmap surface to the backplanes.
See also ...
Shading Patterns