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Description
One of the possible light sources in Octane Render is "Texture Environment", when the image (typically HDR image) acts as omni-directional light source; this is also known as IBL technique en.wikipedia.org/wiki/Image-ba… .
There was some changes in node parameters for that type of lighting in latest (1.5x) versions of Octane Render. In order to rotate environment image now, it's necessary to set these options (shown above with circled frames):

- UV transform: set to '3D Transformation'
- Translation:
      X defines the rotation in horizontal plane
      Y defines the rotation in vertical plane
   Values is inferred from the fact that 1.0 is equal to full turnover or 360 degrees. So, 0.1 = 36 degrees. See lower images as example of rotating, with different values of X.
- Projection: Mesh UV
- Border mode: Wrap Around

Other values are left untouched (Translation: Rotation Order, Rotation and Scale), or can be changed as always according to specific rendering needs (Power, Invert, Gamma and so on).

--
Some links and thanks to:
1) These tips are based on this discussion thread: render.otoy.com/forum/viewtopi…
2) Sample HDR image from www.hdrlabs.com/

Description
One of the possible light sources in Octane Render is "Texture Environment", when the image (typically HDR image) acts as omni-directional light source; this is also known as IBL technique en.wikipedia.org/wiki/Image-ba… .
There was some changes in node parameters for that type of lighting in latest (1.5x) versions of Octane Render. In order to rotate environment image now, it's necessary to set these options (shown above with circled frames):

- UV transform: set to '3D Transformation'
- Translation:
      X defines the rotation in horizontal plane
      Y defines the rotation in vertical plane
   Values is inferred from the fact that 1.0 is equal to full turnover or 360 degrees. So, 0.1 = 36 degrees. See lower images as example of rotating, with different values of X.
- Projection: Mesh UV
- Border mode: Wrap Around

Other values are left untouched (Translation: Rotation Order, Rotation and Scale), or can be changed as always according to specific rendering needs (Power, Invert, Gamma and so on).

--
Some links and thanks to:
1) These tips are based on this discussion thread: render.otoy.com/forum/viewtopi…
2) Sample HDR image from www.hdrlabs.com/