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BricsCADV17ForAutoCADusers-en_INTL

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Modeling and Deforming 3D Surfaces<br />

BricsCAD performs surface modeling using direct modeling commands and 3D constraints. These<br />

commands also work with 3D solids, but now produce or edit surfaces, depending on the context.<br />

AutoCAD also does surface modeling, although it lacks 3D constraints. These are true surfaces,<br />

which can be deformed, and are not the older mesh surfaces found in BricsCAD and AutoCAD since<br />

the 1980s, such as those made with the Ai_Box and PFace commands.<br />

Creating and editing surfaces in BricsCAD works just like in AutoCAD. The vertices, edges, and faces<br />

of surfaces are deformed with the same commands used to deform 3D solids.<br />

Use the following commands to create surfaces:<br />

BricsCAD Surface Modeling Commands<br />

dmDeformCurve deforms surfaces by moving or rotating edges to a specified set of target curves<br />

dmDeformMove moves or rotates edges of surfaces<br />

dmDeformPoint transforms points lying on specified faces<br />

dmDelete removes holes (open loops) and faces from surfaces<br />

dmExtrude extrudes curves, edges, planar entities, and faces into 3D surfaces<br />

dmRevolve revolves curves, edges, planar entities, and faces into 3D surfaces<br />

dmStitch stitches a set of surfaces into a single 3D surface<br />

dmThicken convert surfaces to 3D solids with a specified thickness<br />

TIP When extruding or rotating a 2D entity, BricsCAD converts them automatically depending on their type:<br />

Open 2D entities become 3D surfaces<br />

Closed 2D entities become 3D solids<br />

To turn a 3D surface into a 3D solid, use the dmThicken command.<br />

Accessing Surfacing Commands<br />

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Enter then commands listed above<br />

From the ribbon’s Surfaces tab, choose a command<br />

6 Working in 3D 205

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