PMREMNode: Mark default texture as render target texture. #29044
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Fixes #28970 (comment)
Description
When the defining the default placeholder texture for
PMREMNode, it's important to setisRenderTargetTexturetotrueotherwise the uvs for the WebGL backend won't be correct. Generated PMREM textures are always render target textures and rely on theisRenderTargetTextureflag.