ID 363727 - A difference occurs when disabling the GPU Acceleration while the Inpaint Matte Region is enabled in the SmartVector node.

Problem summary
A difference occurs when disabling the GPU Acceleration while the Inpaint Matte Region is enabled in the SmartVector node.

The user may experience difficulty in rendering with the settings in comparison to using the command line. Please view the workaround below to bypass this.

Customer reported version
nuke.11.2v2

Customer reported platform
centos6

Steps to reproduce

1) In NukeX, place a Read node with any footage.

2) Create a Roto node and draw a spline curve.

3) Drop in a SmartVector node attached with inputs SRC as the Read node, and the Matte as the Roto node.

4) Select the Channel Layer to be any available smartvector, and set the Viewer as 1 on the SmartVector node.

5) Open the Properties bin of the SmartVector node, and adjust the Matte Channel as: Matte Inverted Alpha.

6) Enable the Inpaint Matte Region and view the output of the Viewer.

7) Enable/Disable the GPU Acceleration and view any changes made.

8) Scrub the timeline, repeating step 7 for multiple frames.

Reproduced by Support in:

NukeX 11.2v3 - Windows 10, CentOS 7, macOS 10.13 High Sierra

NukeX 11.2v1 - Windows 10

Unable to reproduce bug in:

NukeX 11.1v5 - Windows 10, CentOS 7, macOS 10.13 High Sierra

Earliest version tested:
NukeX 11.1v5 - This feature did not exist before this version.

Expected behavior
The vector output should remain the same if the GPU Acceleration is enabled/disabled.

Actual behavior
The vector details disappear when the GPU Acceleration knob is disabled.

Workaround
When rendering using the command line, a user can enable the GPU Acceleration knob in the SmartVector node, then enable the --gpu flag on the command line to mimic the behavior seen in the Viewer in Nuke.