Gamma has to do with Linear Workflow, which is a pretty complex topic for another writeup. If a JPG or something else is being used, it will have to go to 2.2 to get it bright enough. Gamma: Leave it at 1 for a properly made. It's a good idea to just choose one place to edit the power and stick with it. Power: This node has its own field for Power which adds to the Power of the Environment tag. Here are the relevant ones for HDRI lighting: HDR file goes into) has its own options that complement the ones in the Environment Tag. Samp.: Helps reduce noise generated by HDRI lighting - leave it on. It does nothing in Pathtracing or PMC modes. You can then adjust settings like density and other things that are out of the scope of this document to get a general fog going in the scene.ĪO Environment Texture:Changes the color of the Ambient Occlusion only if Direct Lighting with Ambient Occlusion is being used. Just hit the Add Fog button and it will set you up with a Scattering Medium node. Go to the Medium tab of the Environment tag. Medium Tab: Another cool thing you can do here is add volumetric fog to the whole scene. Best to just grab the slider and move it until you like the lighting and placement of the image. These values go from -1 to 0 to 1, so a clockwise 90 degree turn would be 0.25, a counterclockwise 180 degree turn would be -0.5, etc. RotX shifts the image horizontally and RotY shifts it vertically. Poweris what is used to change the intensity of any light - this is useful if the HDRI is too dark or bright, or if it's being used in combination with other light sources.
Here are some options you can adjust in the Environment tag itself.
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