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Geometry几何 visible objects in the scene graph场景中显示对象 What is a Geometry? 1:A geometry is the type of spatial that is actually visible on the screen (Geometry几何是spatial空间的一种类型，可以实际显示可见) 2：A geometry has a mesh to define its form and a material to define the appearace(几何体有网格 mesh来定义它的材质和外观) |
geometry.setMaterial(redMaterial);设置材质，红色材质