Interface

Weld nearby vertices

Sets whether to weld nearby vertices of converted objects according to the Weld Threshold setting. Welding smooths across seams and unifies normals of objects with coincident vertices. Welding occurs only on vertices that are part of the same object.

Weld threshold

Sets the distance that determines whether vertices are coincident. If the distance between two vertices is less than or equal to the weld threshold, the vertices are welded together. To use the Weld Threshold, turn on Weld.

Auto-smooth adjacent face

Assigns smoothing groups according to the Smooth-angle value. Smoothing groups determine whether faces on an object render as a smooth surface or display a seam at their edges, creating a faceted appearance.

Smooth-angle

Controls whether smoothing occurs between two adjacent faces. If the angle between the two face normals is less than or equal to the smooth angle, the faces are smoothed (that is, put in the same smoothing group).

Orient normals of adjacent faces consistently

Analyzes the face normals of each object and flips normals where necessary, so they all point in a direction that is consistent with adjoining faces. If the imported geometry isn't properly welded, or if the AutoCAD geometry did not contain or specify normal information, normals might be oriented in the wrong direction. Use the Edit Mesh or Normal modifiers to flip normals.

When Unify Normals is off, normals are calculated according to the face vertex order in the linked file. Face normals for AutoCAD solids are already unified. Turn off Unify Normals when importing only AutoCAD solid models from AutoCAD Architecture.

Cap closed splines

Applies an Extrude modifier to all closed objects, and selects the Cap Start and Cap End options of the modifier. The Extrude modifier Amount value for a closed object with no thickness is set to 0. Capping makes closed objects with thickness appear solid and closed objects without thickness appear flat. When Cap Closed Objects is off, the Extrude modifier Cap Start and Cap End options for closed objects with thickness are clear. No modifiers are applied to closed objects without thickness.

TipUnless you chose the One-to-One sorting option, you won't immediately see the Extrude modifier when selecting an object. To see it, look through the modifier stack for the VIZBlock sub-objects. In a nested VIZBlock, the Extrude modifiers appear at the bottom of the stack. You can then edit the Extrude modifier parameters.

Texture Mapping

The texture mapping setting can reduce the loading time of models that have many objects with stored UVW Coordinates for texture mapped materials.

NoteThis setting applies only to geometry that is stored as a mesh in the scene. Spline shapes marked as renderable have separate controls for UVW coordinate generation; these are found on the Spline Rendering panel.

• Generate Coordinates For All ObjectsAutomatically generates UVW coordinates for all objects when the drawing is linked.

  This option tells the File Link Manager to create UVW coordinates, but loading time is increased while the coordinate generation occurs.

• Generate Coordinates On DemandDoes not generate texture coordinates for linked mesh objects.

  Actively linked objects generate UVW coordinates on demand, so if you assign a material to an object and the material requires texture coordinates, the texture coordinates are silently assigned to that object. If the material or texture map is set to display in viewport, the coordinates are assigned as soon as the material is applied; if not, the coordinates are assigned when the scene is rendered.

  This option gives you faster loading speed, but no UVW coordinate generation.

  NoteObjects in drawings created in AutoCAD Architecture pass texture coordinates explicitly to 3ds Max when you attach the drawing. If you specify on-demand coordinate generation, they might not match the coordinates that were specified in the original drawing. The map scaling is the same, but the texture offsets may be altered.

Curve steps

For objects such as splines, the number of knot points determines the spline's shape and curvature. The Curve steps value defines the number of segments between knot points. A low value gives you a more linear interpolation between the knot points; a higher number gives you a more accurate curve.

Maximum surface deviation for 3D solids

Specifies the maximum allowable distance from the 3ds Max surface mesh to the parametric AutoCAD solid surface. Small numbers produce more accurate surfaces with a greater number of faces. Large numbers produce less accurate surfaces with fewer faces.