Analyzing Solids and NURBS Curves and Surfaces

The Analysis tool provides proximity information for solid objects including NURBS curves and surfaces, solids, and subdivision objects, and intersection, and curvature information for NURBS curves and surfaces.

Two modes are available.

Analysis_modes.png 

Mode
Description

Proximity

Determines the minimum distance between solid objects and 3D loci, or the intersection between solids

Interrogation

Interactively determines the curvature of NURBS curves and surfaces and displays curvature parameters

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Determining Solid Object Proximity

In Proximity mode, the Analysis tool places a 3D locus at the minimum distance or intersection between two solid objects, and a 3D locus and NURBS curve or surface. The tool places a NURBS curve at the intersection of two solids.

Analysis_tool.png 

To analyze solids’ proximity or intersection:

  1. Click the Analysis tool from the 3D Modeling tool set, and then click Proximity from the Tool bar.

  2. Click on a NURBS curve, NURBS surface, solid object, subdivision object, or 3D locus, and then click on another solid object.

Shapes200109.png 

A 3D locus is placed on each NURBS curve at the closest minimum distance or intersecting points between the two items, or a NURBS curve is placed at the intersection of two solids.

Shapes200110.png 

Determining NURBS Curvature, Tangents, and Normals

In Interrogation mode, the Analysis tool provides curvature parameters for NURBS curves and NURBS surfaces. It also shows curvature circles and tangent and normal curves interactively, for any point on the existing curve or surface. Optionally, you can add these curves to the drawing; the tool can also place two 3D loci for each curvature circle: one locus where the circle meets the NURBS curve or surface, and one at the center of the circle.

Analyzing NURBS Curves

Analysis_tool00113.png 

To determine the curvature of a NURBS curve, or create a tangent curve:

  1. Click the Analysis tool from the 3D Modeling tool set, and then click Interrogation from the Tool bar.

  2. Click on the NURBS curve of interest, and then move the cursor along the curve to display the curvature circle (in red) and tangent curve (in blue) at the cursor position.

    3. Interr_1.png 

  3. Click the curve to obtain curve properties at a specific location along the curve. The Curve Properties dialog box opens, displaying curvature parameters for that location.

    4. ►    Click to show/hide the parameters.

  4. To add a curvature circle or tangent curve to the drawing, select the appropriate options and click OK. If you select multiple items, they are created as a group.

Interr_2.png 

Analyzing NURBS Surfaces

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To determine the curvature of a NURBS surface, or create a normal curve:

  1. Click the Analysis tool from the 3D Modeling tool set, and then click Interrogation from the Tool bar.

  2. Click on the NURBS surface of interest and move the cursor along the surface to display the curvature circles (in red) and normal curve (in blue) at the cursor position.

    3. Interr_3.png 

  3. Click again to obtain surface properties at a specific location along the surface. The Surface Properties dialog box opens, displaying curvature parameters for that location.

    4. ►    Click to show/hide the parameters.

  4. To add curvature circles or a normal curve to the drawing, select the appropriate options and click OK. If you select multiple items, they are created as a group.

Interr_4.png 

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Concept: NURBS Curves and Surfaces

 

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