However, in the second instance, because the back side faces are towards the camera, the bump map goes in the opposite direction, making for a very unrealistic material. In the first box, the bump moves towards the camera. You can see that since these materials have a bump map applied to them, they react in 2 very different ways. For example, let’s say I was to apply a brick material within Vray to these two cubes. Some rendering programs are set to ignore back faces in order to increase performance (avoid rendering faces you’re not meant to see). While all rendering programs are a bit different, in general they work better with front faces than back faces. This is important for a couple different reasons – the first is rendering programs. Because SketchUp is a face modeler (meaning it creates all of its geometry as faces) instead of a solid modeler, it needs to keep track of which face is the front side and which face is the back side of each face. As most of you know, SketchUp faces have a front side and a back side.I’ve gotten this question several times in the past couple weeks, and I wanted to address it really quick in a video. If so, please consider supporting me on Patreon (click here to support) or by visiting my Support the Show Page! Face orientation affects rendering, 3D printing, and more!ĭo you like these SketchUp tutorials and videos? In this video, we talk about the importance of using the front and back sides of faces in SketchUp. FRONT AND BACK SIDES OF FACES in SketchUp and Why They Matter
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