Problem summary
Geo-Channel nodes can ignore Background Color if the imported images have no alpha channel
If a partial UDIM sequence is imported into a Geo-Channel, and the images have no alpha, the empty UDIMs will display black instead of using the viewed Geo-Channel node's Background Color attribute.
This issue seems to affect EXR and TIFF images, but not PNG or TGA.
Customer reported version
Mari 5.0v4
Customer reported platform
n/a
Steps to reproduce
1) Download the attached image
2) Create a project from an Object with at least two UDIMs
3) In the Objects palette, click the I button next to a Geo-Channel to open the Import into Geo-Channel dialog
4) Switch to the Named Files tab
5) Select the downloaded image as the path for UDIM 1001 and click Import All Patches
6) Go to the UV view
7) Create a Geo-Channel node and view it
8) In the Geo-Channel node properties, select the Geo-Channel that the image was imported into
Expected behaviour
The empty UDIMs should be filled with the Background Color set in the Geo-Channel node properties (transparent by default):
Actual behaviour
The empty UDIMs are filled with black:
Workaround
Unknown.
Reproduced by support
This bug has been reproduced in:
Mari 5.0v4 - Windows 10 - CentOS 7.9
Mari 4.6v1 - Windows 10 - CentOS 7.9
Earliest version tested
Mari 4.6v1 - This feature did not exist before this version
