Class representing a square mesh. Class representing a square [PrimitiveMesh]. This flat mesh does not have a thickness. By default, this mesh is aligned on the X and Y axes; this default rotation is more suited for use with billboarded materials. Unlike [PlaneMesh], this mesh doesn't provide subdivision options. $DOCS_URL/07_demo_projects/viewport/gui_in_3d $DOCS_URL/07_demo_projects/viewport/2d_in_3d Offset of the generated Quad. Useful for particles. Size on the X and Y axes.