Part 7 - Layers.
There are four "layers" in VS3D. Layers can be used to separate different design elements for individual manipulation. The final surface, as displayed, is the summation of all the heights on all layers that are visible. Layers 1 through 3 are available for sculpting activities. Layer 4 is reserved for machining activities. Only one layer is active at a time. So far in this tour, all sculpting activity has been performed on the default layer (layer 1). The current work layer, and the individual layer visibilities, can be set by selecting the "Edit / Work Layer..." menu. The Work Layer dialog allows one "Current" layer to be chosen, and any combination of layers to be set visible or invisible. However, the current work layer must always be visible.
The "Layer Math" tool is very useful for moving sculpture elements from one layer to another and for other layer manipulation. Select the "Edit / Layer Math..." menu. The Layer Math dialog allows you to essentially enter a mathematical equation to be performed using individual layers. Examples are:
Layer_1 = Layer_1 + 2.0
Layer_1 = Layer_1 + Layer_2
Layer_3 = Layer_2 > Layer_3 (each grid point on layer 3 is set to the greater of layer 2 and layer 3)
Layer_2 = 0.0
Other available operators include "/" (divide), "^" (raise to the power of), and "<" (the lesser of).
Select the "Edit / Layer Math..." menu. Enter the equation "Layer_1 = Constant", and leave the Constant value at 0.
Click on "Ok". This will set all grid points on layer 1 to a height of 0 and make the surface flat again. Note that this is an easy way to "erase" existing surface sculpture on a particular layer.