Command Line 6.2.10

3.25. coons command

Description: Creates a coons patch through a selected loop of 2, 3 or 4 curves.

Inline mode usage:

  • coons -h: Displays the help file that summarizes the parameters for this command.
  • coons –s all: Selects all curves of the scene.
  • coons –s <name>: Selects <name> curve.

Interactive mode usage:

  • Invocation: coons
  • Parameters:
    • Two, three or four curves used for the creation of the coons patch. The set of selected curves must form a closed loop.

Example:

We are going to create a coons patch from a set of four curves, so the first step is to create the curves. For this, we will use the curveInterpolation command:

>curveInterpolation

Degree [3]: 3

Select curve points [Press Enter when done]

Point 0 [x y z]: 0 0 0

Point 1 [x y z]: 1 0 2

Point 2 [x y z]: 2 0 1

Point 3 [x y z]: 4 0 0

Point 4 [x y z]:

>curveInterpolation

Degree [3]: 3

Select curve points [Press Enter when done]

Point 0 [x y z]: 4 0 0

Point 1 [x y z]: 4 1 0.5

Point 2 [x y z]: 4 3 1

Point 3 [x y z]: 4 4 0

Point 4 [x y z]:

>curveInterpolation

Degree [3]: 3

Select curve points [Press Enter when done]

Point 0 [x y z]: 4 4 0

Point 1 [x y z]: 3 4 0.5

Point 2 [x y z]: 1 4 0

Point 3 [x y z]: 0 4 2

Point 4 [x y z]:

>curveInterpolation

Degree [3]: 3

Select curve points [Press Enter when done]

Point 0 [x y z]: 0 4 2

Point 1 [x y z]: 0 2 1

Point 2 [x y z]: 0 1 0.25

Point 3 [x y z]: 0 0 0

Point 4 [x y z]:

Remember that you need to press Enter when all the points of a curve have been introduced. The result of these curves are shown in the following figure:

Curves used for the coons patch

 

Now we are going to create the coons surface. To do this, use the coons command:

>coons

Select a closed set of 2, 3 or 4 curves (press Enter when done): 

The result is shown in the following figure:

Resulting coons patch

 

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