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Maniphest T44629

editing material nodes that aren't connected to the output (aka orphan nodes) still causes viewport to re-render
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Description

System Information
Windows 8.1, EVGA GTX 560 Ti

Blender Version
2.73

Short description of error
editing material nodes that aren't connected to the output (aka orphan nodes) still causes viewport to re-render (if it's in live render mode)

Exact steps for others to reproduce the error
create a node-based material
disconnect any node from the output
change any info in this disconnected node
viewport will re-render

Event Timeline

Dimitro (dimailer) created this task.May 7 2015, 7:09 AM
Dimitro (dimailer) raised the priority of this task from to 90.
Dimitro (dimailer) updated the task description. (Show Details)
Dimitro (dimailer) added a project: BF Blender.
Dimitro (dimailer) edited a custom field.
Dimitro (dimailer) added a subscriber: Dimitro (dimailer).
Brecht Van Lommel (brecht) changed the task status from Unknown Status to Unknown Status.May 7 2015, 10:50 AM
Brecht Van Lommel (brecht) claimed this task.

This is a known limitation since Cycles was implemented. Yes we would like to avoid updating on every change, but the shader node synchronization system is not smart enough yet to detect that these changes will have no effect on the final render. It's on the to do list to implement once.