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Geometry Options of Importing AutoCAD to Max
Geometry Options of Importing AutoCAD to Max
Geometry Options of Importing AutoCAD to Max.
The Geometry Options include:
Weld: Globally welds adjacent vertices of AutoCAD objects into a single your 3D Application (Free 3d mdoel) vertex based on the Weld Threshold distance. This works only when objects are imported with the Convert to Single Objects option mentioned above. Global welding can be problematic. Global welding with too high a Weld Threshold setting can cause smaller details to collapse in Mesh objects.You should definitely uncheck Weld for all ACIS solid models from AutoCAD and from surface models if you are having any sort of problem. You get more predictable results from Welding objects manually after they are imported into your 3D Application.
Weld Threshold: Range = 0.0-999999.0. The Weld Threshold amount is in system units. If two or more vertices are within a distance less than or equal to the setting, they are welded into one vertex. If you have something such as window trim that projects two inches from the facade and the Weld Threshold is set to two inches, all trim collapses unpredictably.
Auto-smooth: Auto-smooth assigns smoothing group numbers to faces based on the angle they meet at a shared edge. If adjacent faces share a common smoothing group number, the edge appears smoothed. If faces do not share a common group, the edge appears sharp.Smoothing problems can show in imported DWG files along with welding problems. They manifest themselves as faces that appear darker or lighter than their neighbors. Make sure a your 3D Application object is properly welded, next remove all smoothing group numbers, and then manually apply Auto-smooth or specific smoothing group number assignments.
Smooth Angle: Range = 0-90. Smooth Angle determines at which angle faces must meet to receive a common smoothing group number.
Unify Normals: With Unify Normals checked, the import process tries to make all face normals point in the same direction relative to the center of the object. Flipped face normals appear as "holes" in the your 3D Application mesh object free 3d model. ACIS solid models already are unified and should have Unify Normals unchecked. Flipped faces are a fairly common problem with AutoCAD objects and improperly welded faces can be a cause of flipped faces. First, weld the mesh and then render the object either with a two-sided material applied, or by checking the 2-Sided option in Views/View port Configuration. If faces are flipped, they appear rendered, but if they are missing completely, you still see the hole. If faces are flipped, use the Normal modifier or edit the mesh at Sub-Object/Face and flip them individually. If faces are missing, you can build new faces or use a Cap Holes modifier.
Cap Closed Entities: Applies a your 3D Application Extrude modifier to all closed AutoCAD entities and puts capping faces at each end. Closed AutoCAD entities with no thickness have an Extrude modifier with a height of 0 and appear as flat faces. When the Cap Closed Entities is unchecked, entities with thickness are still extruded, but no end caps are applied. Entities with no thickness are imported as your 3D Application 2D shapes. The final section of the Import AutoCAD DWG File dialog box, ACIS Options, offers one setting:
Surface Deviation: Range = 0.001-999999.0. This is the maximum distance in system units from the surface of an AutoCAD ACIS solid model and the Mesh object in your 3D Application. Smaller numbers make a tighter fit or a more accurate Mesh object. Small Surface Deviation settings can create very complex Mesh objects in your 3D Application. Large settings can cause lost detail in a model (Free 3d model)