# Modeling using 3D solids

May 5th, 2015
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Primitive Modeling Many objects can be described mathematically using basic geometric forms. Modelers are designed to support a set of geometric primitives, such as cubes, right rectilinear prisms (i.e., blocks), right triangular prisms (i.e., wedges), spheres, cones, torus, and cylinders Wedge

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Modeling using 3D solidsModeling using 3D solids1- Primitive Modeling Many objects can be described mathematically using basic geometric forms. Modelers are designed to support a set of geometric primitives, such as cubes, right rectilinear prisms (i.e., blocks), right triangular prisms (i.e., wedges), spheres, cones, torus, and cylinders WedgeBoxBoxCylinderwedgeUser Coordinate System (UCS)Origin UCS X, Y,Z Rotate UCSExampleBox BBox ADimensions1- Box ALength= 100 mm Width = 50 mm Height = 60 mmBox BBox A2- CylinderDiameter = 40 mm Center point = The center of box A Depth = 30 mm3- Box BLength= 30 mm Width = 30 mm Height = 5 mm4- WedgeLength= 30 mm Depth = 30 mm Height = 30 mmAssignment2- Constructive Solid Geometry (CSG) ModelingConstructive solid geometry (CSG) modeling is a powerful technique that allows more flexibility than primitive instancing in both the way primitives are defined and the way they are combined. The relationships between the primitives are defined with Boolean operations. There are three types of Boolean operations: 1- Union (U) 2- Difference (-) 3- Intersection (n)Example :Example :Exercise: (from your textbook page 268)Create the following component1- to draw the CylinderSelect the Cylinder tool from the Solids toolbar. Command: _cylinder Specify centre point for base of cylinder or [Elliptical] : enter Specify radius for base of cylinder or [Diameter]: enter 50 Specify height of cylind

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