I thought "This could probably be solved with an OSL script!"
And so it could!
The attached OSL script will rotate the environment texture along the Z-axis (according to the set Rotation value).
A Rotation value of 1 is 360 degrees (there's no limit on the Rotation, so you could rotate several turns in one animation).
The Rotation value is "keyframable".
Just add a OSL Projection node in the Environment Texture, select the OSL-script (and run it), connect it to the Project of the ImageTexture node (and you probably have to connect an Spherical Projection node to the Projection input of the OSL-node)
A small caveat:
The script works perfectly in Stand Alone, but in Octane Blender there is some problems:
* It doesn't "default" to Spherical Projection (so you'll need to add & connect it).
* For some reason it does't update in the viewport when you change the Rotation value (You have to go out of rendered view, and then back in again). But it should work fine when rendering an animation! (ETA: Rendered a test animation at it works fine!)
Strangely enough, OSL-files aren't allowed as attachments, but it's short, so here it is (copy and paste to a textfile in Blender):
Code: Select all
shader OslRotationProjection(
float Rotation = 0.0,
point Projection = 0 [[ string inputType = "projection:spherical" ]],
output point uvw = 0)
{
uvw = Projection;
uvw[0] = uvw[0] + Rotation;
}
