how to draw cvd by 3d max

CV curves are NURBS curves controlled by control vertices (CVs). The CVs don't lie on the curve. They define a control lattice that encloses the curve. Each CV has a weight that you can adjust to change the curve.

While y'all're creating a CV curve yous tin click to create more than than ane CV at the same location (or shut to it), increasing the influence of the CVs in that region of the bend. Creating two ancillary CVs sharpens the curvature. Creating three coincident CVs creates an athwart corner in the curve. This technique tin help you shape the bend; however, if you after move the CVs individually, you lose this effect. (You lot can also obtain the influence of multiple CVs past fusing CVs.)

A CV bend can exist the ground of a full NURBS model.

CVs shape the control lattice that defines the curve.

Drawing Three-Dimensional Curves

When you create a CV curve, you lot can draw information technology in three dimensions. There are two ways to do this:

• Describe In All Viewports: This toggle lets you lot use whatever viewport to depict the curve, enabling you to draw iii dimensionally.
• Using Ctrl to drag CVs: While you lot draw a curve, you tin utilize the Ctrl key to drag a CV off of the construction plane.

With the Ctrl-central method, further mouse move lifts the latest CV off the construction aeroplane. At that place are two ways to employ this:

• Click-elevate. If yous hold downward Ctrl and also hold down the mouse button, yous tin elevate to change the height of the CV. The CV's location is set when yous release the mouse button.

  This method is probably more intuitive.

• Click-click. If you lot Ctrl+click and then release the mouse push button, the height changes as you drag the mouse. Clicking the mouse a second time sets the CV's location.

  This method is less decumbent to repetitive stress injury.

While you are offsetting the CV, a red dotted line is drawn between the original CV on the structure airplane and the actual CV offset from the aeroplane. Yous tin can move the mouse into an inactive viewport, in which case 3ds Max sets the acme of the CV using the CV'south Z axis in the inactive viewport. This lets you set the height of the CV with accuracy.

Snaps also work when you modify the height of a CV. For case, if you turn on CV snapping, you tin set a CV to have the same height as another CV by snapping to that other CV in an inactive viewport.

Procedures

To create a NURBS CV curve:

1. Go to the Create panel.
2. Activate (Shapes), and choose NURBS Curves from the drop-downwards listing.
3. Turn on CV Curve.
4. In a viewport, click and drag to create the first CV, every bit well every bit the first curve segment. Release the mouse to add the second CV. Each subsequent location you lot click adds a new CV to the bend. Correct-click to cease curve creation.

   Note: If you begin the curve by clicking without dragging, this likewise creates the curve's first CV. All the same, if you release the mouse more five pixels away from where you initially pressed it, this creates an additional CV.

   While you are creating a CV curve, you can press Backspace to remove the last CV you created, so previous CVs in reverse order.

   If Depict In All Viewports is on, you can describe in any viewport, creating a 3D curve.

   To elevator a CV off the construction plane, utilise the Ctrl key every bit described earlier in this topic under "Cartoon 3-Dimensional Curves."

   As with splines, if you click over the curve's initial CV, a Close Curve dialog is displayed. This dialog asks whether y'all desire the curve to be closed. Click No to go along the curve open or Yes to close the curve. (You lot can too close a curve when you edit it at the Curve sub-object level.) When a closed curve is displayed at the Curve sub-object level, the initial CV is displayed as a light-green circumvolve, and a green tick marker indicates the curve's direction.

5. Adapt the curve'due south creation parameters.
6. (Optional) To add a new NURBS curve sub-object, you can turn off the Start New Shape checkbox, and so repeat the preceding steps.

Interface

The creation parameters are the aforementioned for both point curves and CV curves.

Rendering rollout

Enable In Renderer

When on, the shape is rendered equally a 3D mesh using the Radial or Rectangular parameters set for Renderer.

Enable In Viewport

When on, the shape is displayed in the viewport as a 3D mesh using the Radial or Rectangular parameters ready for Renderer.

Note: This brandish is not supported by Nitrous. If you wish to view the 3D mesh, switch to either the legacy Direct3D or OpenGL driver.

Apply Viewport settings

Lets you gear up unlike rendering parameters, and displays the mesh generated by the Viewport settings. Available only when Enable in Viewport is turned on.

Generate Mapping Coords

Plough this on to utilize mapping coordinates. Default=off.

The U coordinate wraps once around the thickness of the spline; the V coordinate is mapped once forth the length of the spline. Tiling is achieved using the Tiling parameters in the material itself.

Real-World Map Size

Controls the scaling method used for texture mapped materials that are practical to the object. The scaling values are controlled by the Use Real-World Scale settings found in the applied material's Coordinates rollout. Default=on.

Viewport

Turn this on to specify Radial or Rectangular parameters for the shape every bit it will brandish in the viewport when Enable in Viewport is turned on.

Renderer

Plow this on to specify Radial or Rectangular parameters for the shape as it will display when rendered or viewed in the viewport when Enable in Viewport is turned on.

Radial

Displays the 3D mesh as a cylindrical object.

Thickness

Specifies the bore of the viewport or rendered spline mesh. Default=i.0. Range=0.0 to 100,000,000.0.

Splines rendered at thickness of one.0 and 5.0, respectively

Sides

Sets the number of sides (or facets) for the spline mesh n the viewport or renderer. For example, a value of four results in a square cantankerous section.

Angle

Adjusts the rotational position of the cross-department in the viewport or renderer. For case, if the spline mesh has a square cantankerous department you can utilize Angle to position a "flat" side down.

Rectangular

Displays the spline's mesh shape equally rectangular.

Aspect

Sets the attribute ratio for rectangular cross-sections. The Lock checkbox lets you lot lock the aspect ratio. When Lock is turned on, Width is locked to Depth that results in a abiding ratio of Width to Depth.

Length

Specifies the size of the cross–section along the local Y axis.

Width

Specifies the size of the cross–department along the local X axis.

Angle

Adjusts the rotational position of the cross-section in the viewport or renderer. For case, if y'all have a foursquare cross-department you tin can use Angle to position a "flat" side down.

Auto Smooth

If Auto Smooth is turned on, the spline is machine-smoothed using the threshold specified by the Threshold setting below it. Auto Smooth sets the smoothing based on the bending betwixt spline segments. Whatsoever two adjacent segments are put in the same smoothing group if the angle betwixt them is less than the threshold bending.

Threshold

Specifies the threshold angle in degrees. Any 2 next spline segments are put in the same smoothing group if the angle between them is less than the threshold angle.

A curve and the aforementioned curve rendered with thickness

Keyboard Entry rollout

The Keyboard Entry rollout lets yous create a NURBS curve past typing. Use the Tab key to move between the controls in this rollout. To click a button from the keyboard, press Enter while the button is active.

X, Y, and Z

Let you enter the coordinates of the next CV to add.

Add Point

Adds the CV to the curve.

Weight

Enter a weight for the CV.

Close

Ends cosmos of the curve and creates a segment betwixt the last CV and the initial CV, to make the curve a airtight bend.

Finish

Ends creation of the bend, leaving it open concluded.

Create CV Curve rollout

This rollout contains the controls for curve approximation.

Interpolation grouping

The controls in this group box alter the accuracy and kind of curve approximation used to generate and display the curve.

Describe In All Viewports

Lets yous employ any viewport while you are drawing the curve. This is one way to create a 3D curve. When off, y'all must cease drawing the curve in the viewport where you began it. Default=On.

While Draw In All Viewports is on, y'all can likewise use snaps in any viewport.

Automatic Reparameterization group

The controls in this group box let yous specify automated reparameterization. They are similar to the controls in the Reparameterize dialog, with 1 addition: all choices except for None tell 3ds Max to reparameterize the curve automatically; that is, whenever you edit it past moving CVs, refining, and and so on.

• None Practice not reparameterize automatically.
• Chord Length Chooses the chord-length algorithm for reparameterization.

  Chord-length reparameterization spaces knots (in parameter space) based on the foursquare root of the length of each bend segment.

  Chord-length reparameterization is usually the all-time choice.

• Uniform Spaces the knots uniformly.

  A uniform knot vector has the reward that the curve or surface changes only locally when you edit it. With the other ii forms of parameterization, moving any CV can alter the entire sub-object.

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Source: https://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/CloudHelp/cloudhelp/2021/ENU/3DSMax-Modeling/files/GUID-FC561769-06AA-446F-8B82-BF29B2EAAA3E-htm.html

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