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per the Maya documentation:
Node State
Changing the node state can improve performance. There are six possible node states:
Normal
Causes the node to behave normally, according to the defined settings and effects. This is the default.
HasNoEffect
Disables any effects on the node so that fewer calculations are necessary at the time of redraw. The effect does not render until you reset the Node State back to Normal. Maya evaluates the nodes in the node’s history, but not the node itself.
For example, if you translate a cluster to deform a geometry, then set the Node State of the cluster node to HasNoEffect, the geometry appears undeformed, as though the translation had not occurred. To view the effect, change the Node State back to Normal.
Blocking
Temporarily hides the node and does not display the results of any input (input evaluations) to the node. This can speed the redraw. It is also useful when you have complex scenes and want to edit only one aspect of a node. Blocked nodes do not render.
For example, if you have a complex revolved surface and want to edit the curve, but don’t want to wait while the curve redraws, select Blocking and edit the curve. To display the modified revolved surface, reset the Node State to Normal.
n8skow [FA]
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