V_Test

Tests geometrical characteristics of objects.

Command: v_test

Select curve / surface to test: Select v-curve, AutoCAD spline polyline, AutoCAD spline (NURBS), v-surface, AutoCAD quadratic fit mesh, AutoCAD cubic fit mesh, AutoCAD Bezier fit mesh.

Options of command line

Parameters of the command depend on the selected object: a curve or a surface.

Curve

Enter a displaying option [Display / Radius / Curvature / Scale factor / Exit]: Enter an option.

• Display
  Displays a curve with indication of curvature.
• Radius
  Option defines mode of displaying radiuses of curvature.
• Cuvature
  Option defines mode of displaying curvature.
  

Scale factor

Multiplies the dimensions of the displaying curvature by the specified scale. A scale factor greater than 1 enlarges the image. At value of scale factor curvature is more than zero curvature is drawn in a direction of the main curvature, at negative values in an opposite direction.

Enter new option Scale factor <current>: Enter a value or press ENTER.

Surface

Enter a displaying option [Display / IndSign / UIndicat / VIndicat / UVIndicat / Exit]: Enter an option.

• Display
  Displays a curve with indication of curvature.

Option IndSign

Displays areas with constant sign of curvature. Positive values - color 2, negative 3, zero values 1.
Enter a displaying option [Off / CrvtU / CrvtV / GaussCvt / ArithmCvt ]: Enter an option.

• Off: Cancels the displaying of sign of curvature;
• CrvtU: Displays sign of curvature r(u, v_constant);
• CrvtV: Displays sign of curvature r(u_constant, v);
• GaussCvt: Displays sign of Gaussian curvature;
• ArithmCvt: Displays sign of arithmetic-mean curvature;

Option UIndicat

• Displaying curvature of testing curve r(u, v_constant).
• Enter a displaying option [Off / Radius / Cuvature / Scale / V_Constant / Exit]: Enter an option.
• Radius: Defines mode of displaying radiuses of curvature.
• Cuvature: Defines mode of displaying curvature.
• Scale (Scale factor): Multiplies the dimensions of the displaying curvature by the specified scale. A scale factor greater than 1 enlarges the image. At value of scale factor curvature is more than zero curvature is drawn in a direction of the main curvature, at negative values in an opposite direction.

Enter new option Scale factor <current>: Enter a value or press ENTER.

V_Constant: Specifies value of internal parameter v of a surface r(u,v) for testing curvature of a curve r(u, v_constant).

Enter new option V_Constant <current>: Enter a value or press ENTER.

Option VIndicat

Displaying curvature of testing curve r(u_constant, v).

• Enter a displaying option [Off / Radius / Cuvature / Scale / U_Constant / Exit]: Enter an option.
• Radius: Option defines mode of displaying radiuses of curvature.
• Cuvature: Option defines mode of displaying curvature.
• Scale (Scale factor): Multiplies the dimensions of the displaying curvature by the specified scale. A scale factor greater than 1 enlarges the image. At value of scale factor curvature is more than zero curvature is drawn in a direction of the main curvature, at negative values in an opposite direction.

Enter new option Scale factor <current>: Enter a value or press ENTER.

V_Constant: Specifies value of internal parameter v of a surface r(u,v) for testing curvature of a curve r(u_constant, v).

Enter new option V_Constant <current>: Enter a value or press ENTER.

Option UVIndicat

Displays map of areas of distribution of values of curvature on a surface (curvature of lines on a surface, Gaussian curvature, arithmetic-mean curvature). The area of the certain color corresponds to the certain range of change of curvature. In this case 7 colors define 7 levels of gradation of change of value of the tested parameter.

Enter a displaying option [Off / CrvtU / CrvtV / GaussCvt / ArithmCvt ]: Enter an option.

• Off: Cancels the displaying curvature;
• CrvtU: Displays curvature of r(u, v_constant);
• CrvtV: Displays curvature of r(u_constant, v);
• GaussCvt: Displays Gaussian curvature;
• ArithmCvt: Displays an arithmetic-mean curvature;

The connected system variables

• SplineSegs: Sets the number of lines approximating segment of spline for displaying.
• SplFrame: Controls the display of splines and spline-fit polylines.
  
  • 0 Does not display the control frame for splines and spline-fit polylines. Displays the fit surface of a polygon mesh, not the defining frame-mesh.
    
  • 1 Displays the control frme for splines and spline-fit polylines.