# L05 - Solid Modeling Primitives and Boolean Operations...

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Solid Modeling – Primitives  and Boolean Operations  GE101 Engineering Graphics and Design

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Solid Primitives  Primitives  are simple solid objects  created directly in a CAD system Examples include: box, sphere, cylinder,  cone, wedge, torus

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Model Building in AutoCAD Length  - in x axis direction Width  - in y axis direction Height  - in z axis direction Length, width and height can be  positive or negative  A positive dimension indicates  movement in direction of positive axis A negative dimension indicates  movement in opposite, or negative  direction In AutoCAD, the following dimensions are  associated with the three coordinate axes:
Solid Composites Primitives combined using  Boolean  operations  to create  solid composites Boolean operations used in solid modeling  are:  Union Intersection  Subtraction

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Union Union means set of all elements  belonging to either A or  B

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Unformatted text preview: A ∪ B Union of two or more solids creates a composite solid composed of combined volumes of these solids In set theory, the union of two sets, A and B, is represented pictorially as: Intersection Set of all elements belonging to both A and B A ∩ B Intersection of two or more solids creates a composite solid composed of volume common to original solids Intersection of two sets, A and B: Subtraction 1 Set of all elements belonging to A but not B A – B Subtraction of two solids creates a composite solid composed of volume of first solid minus common volume shared with second solid Subtraction of two sets, A and B: Subtraction 2 Alternatively, B - A is represented pictorially as: Solid Modeling – Primitives and Boolean Operations Chega !...
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• Fall '05
• Leake
• Intersection, boolean operations, B Union

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