Driver to node tree not working #41899

New Issue

St. John Peaster · 2014-09-21T17:50:50+02:00

St. John Peaster commented

2014-09-21 17:50:50 +02:00

System Information
Windows 8, Ti NVIDIA GTX 550

Blender Version
Broken: 2.71 - Hash: 9337574

Short description of error
Drivers dependent on inputs from node trees are only returning zero

Exact steps for others to reproduce the error
Create a cycles compositing node setup
Add a fast Gaussian blur node
Group the fast Gaussian blur node
Add an input to the node group called "blur_Amount"
Tab out and copy the data path of that blur_amount input
Inside the node group, add a driver to the Fast Gaussian X attribute
Set the driver to be maximum value, single property
For Prop: choose "NodeTree" and select the group you just made
Then paste in the data path you copied a couple steps back

Nothing happens for me, I just get zero.
I also tried changing the end to be .value instead of .default_value
As well as removing the .default_value entirely so it is just <nodes["grouname"].inputs>
Nothing even returns an arror

Interestingly - If I paste that same driver onto a blur node outside of the group, I at least get ERROR: Invalid taget channel(s)

I've never tried to do this before, but I believe it is a bug because, why else would nodeTree even be an option? And why would it emediately show all the node groups I have created in a drop down? It seams like this should work.

Thanks!

**System Information** Windows 8, Ti NVIDIA GTX 550 **Blender Version** Broken: 2.71 - Hash: 9337574 **Short description of error** Drivers dependent on inputs from node trees are only returning zero **Exact steps for others to reproduce the error** Create a cycles compositing node setup Add a fast Gaussian blur node Group the fast Gaussian blur node Add an input to the node group called "blur_Amount" Tab out and copy the data path of that blur_amount input Inside the node group, add a driver to the Fast Gaussian X attribute Set the driver to be maximum value, single property For Prop: choose "NodeTree" and select the group you just made Then paste in the data path you copied a couple steps back - - Nothing happens for me, I just get zero. I also tried changing the end to be .value instead of .default_value As well as removing the .default_value entirely so it is just <nodes["grouname"].inputs[X]> Nothing even returns an arror Interestingly - If I paste that same driver onto a blur node outside of the group, I at least get ERROR: Invalid taget channel(s) I've never tried to do this before, but I believe it is a bug because, why else would nodeTree even be an option? And why would it emediately show all the node groups I have created in a drop down? It seams like this should work. Thanks!

St. John Peaster commented

2014-09-21 17:50:50 +02:00

Changed status to: 'Open'

St. John Peaster self-assigned this 2014-09-21 17:50:50 +02:00

St. John Peaster commented

2014-09-21 17:50:50 +02:00

Added subscriber: @stjohn3d

St. John Peaster removed their assignment 2014-09-21 17:54:03 +02:00

Bastien Montagne commented

2014-09-21 18:24:04 +02:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2014-09-21 18:24:04 +02:00

Bastien Montagne self-assigned this 2014-09-21 18:24:04 +02:00

Bastien Montagne commented

2014-09-21 18:24:04 +02:00

Thanks for the report, but drivers simply do not work in nodes, this is a long-standing known TODO (see our TODO list), and not considered a bug.

Thanks for the report, but drivers simply do not work in nodes, this is a long-standing known TODO (see [our TODO list](http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Animation)), and not considered a bug.

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Driver to node tree not working #41899