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Preview windows and the r.PostProcessing.UserSceneTextureDebug mode were updated to handle material instances. If both a base material and an instance of it are being edited, the instance will be preferred in other preview windows over the base material, rather than including both and having their effects potentially overlap. Sorting of previewed materials was improved by ordering them in the reverse order they are encountered, so dependencies earlier in a chain are added first. Fixed cases where preview windows weren't refreshed on certain types of changes or debug mode toggling. To handle generic materials that can work at multiple resolutions, a "ScaleRelativeToInput" field was added, which generates the output resolution relative to a given User Scene Texture input. Positive divisors downsample, while negative divisors upsample (so 2 would divide resolution by 2, while -2 would multiply by 2). To handle the use of a generic material where you want the input or output to be SceneColor (say a first pass that reads SceneColor, or a last pass that writes SceneColor), you now have the option to specify "SceneColor" as a User Scene Texture input or output name. This special name doesn't create a transient User Scene Texture, but just hooks up SceneColor itself. The final feature added is a flag which suppresses PreExposure adjustments (multiply by View.OneOverPreExposure on input, multiply by View.PreExposure on output), useful if creating a material that doesn't care about the absolute value of linear colors (such as a blur where the inputs and outputs have the same scale), or where the output is not a linear color (such as a mask, modulation, or some sort of non-color data like positions, normals, offsets, IDs, etc). Especially simplifies writing custom HLSL by avoiding the need for confusing View.OneOverPreExposure.xxx boilerplate, in addition to providing a minor perf gain. #jira UE-215194 #rb eric.renaudhoude, Jason.Nadro, Ruslan.Idrisov [CL 34375539 by jason hoerner in ue5-main branch]