The Raw Reflection Render Element stores reflection information calculated from the materials' reflection values reflection values in the scene. Surfaces with no reflection values set in their materials will contain no information in the render element, which means these areas will render as black. When the Raw Reflection Render Element is multiplied by the Reflection Filter (vrayRE_Reflection_Filter), the Reflection (vrayRE_Reflection) Render Element is produced.
vrayRE_Raw_Reflection gives the full reflection of objects reflecting in the scene, while the reflection filter vrayRE_Reflection_Filter sets how much of that reflection should come through in the composite. In other words, the filter defines the strength of the reflection, while the raw image defines what is being reflected in the image. When these two elements are multiplied, the true level of reflection is given as the vrayRE_Reflection Render Element. By using these component parts of the reflection, you can fine-tune the reflection in your final composite.
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UI Path: ||Display Render Settings button|| > Render Elements tab > Raw Reflection
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To use render elements, select from the Available render elements column and click the Add button to add the passes you wish to generate at render time. When you render the scene, the added render elements listed in the column on the right, will also render, which can be viewed from the VFB window's channel drop-down menu.
For more information on the parameters on this dialog, see the Render Elements tab page.
