2009

Selected Edges Emits particles from the current edge sub-object selection.
Selected Faces Emits particles from the current face or polygon sub-object
selection.
You can modify the Location choice with any combination of the following:
Surface Offset Lets you specify a range of distances from the object surface
for particle placement.
Surface Offset is unavailable when Location is set to Pivot or Volume. Use the
Min and Max parameters to set the range.
NOTE Negative values offset the particles below the surface.
Min/Max When Surface Offset is on, these let you specify the range of offset
distances from the object surface. The Min value cannot exceed the Max value,
and vice-versa. If you try to raise Min above Max, or lower Max below Min,
both values change equally.
Density by Material Varies emission over the emitter surface based on
properties of the material applied to the emitter. For example, if the object is
assigned a black-and-white checkered diffuse map and you choose the
Grayscale option, particles are emitted only from the white checks.
IMPORTANT For material-influenced emission to appear properly in the viewports,
two conditions are required:
■ At least one viewport must be set to a shaded display mode.
■ The material or map must have Show Map In Viewport turned on in the
Material Editor.
The options are as follows:
■ Grayscale The software internally converts the material-based coloring
(diffuse) to grayscale, and then emits more particles in lighter areas and
fewer in darker areas.
2858 | Chapter 14 Space Warps and Particle Systems