fix(examples): add envmap for PBR materials in 3d tiles loader example #2497
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Description
This PR add a global environment map on the scene for all PBR materials in the
3d-tiles-loaderexample. The absence of such map caused meshes with only diffuse colors to render totally black.I decided to use the
RoomEnvironmentin conjonction with thePMREMGeneratorto generate the env map. This is the technique used in a lot of three examples. The end-result:I used the following datasets generated from
tylerto test this change:3dtiles-terrain.zip