The Blob shader renders particles as 3D blobby objects that can flow like the semi-liquid wax balls you see in lava lamps. This shader is attached to the particle type by default when you create a fluid cloud.

The Surface Evaluation parameters let you specify how much the particles flow into one another. The Blending Amount slider lets you set no blending (0) to an exaggerated blending (1) where the individual blobs are barely distinguishable. Softimage tries to keep the blob radius constant in accordance to the blending amount you specify, but as the value increases toward 1, the blobs may start to thicken. Keep this value below 0.5 for more consistent blob blending.

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While you can’t blend blobs between multiple particle clouds, you can blend between multiple particles types on the same cloud. |
The Texture Projection parameters dictate the projection (cylindrical, lollipop, etc.) and blending of the textures. If the particles have 3D rotations on them, you can choose to render them.
For more details on each of the parameters, see Particle Blob [Shader Reference].

Autodesk Softimage v.7.5