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ManualsBrandsAutodesk ManualsApplications3ds Max

1211

Ruled Surface 1193

Center—

Locatesthelatheaxisatthecurve’scenter.

Max—Locatesthelatheaxisatthecurve’spositive

local X-axis boundary.

Start Point—Adjusts the position of the curve’s

start point. This can help eliminate unwanted

tw ists or "buckles" in the surface.

Thiscontrolisdisabledifthecurveisnotaclosed

cur ve.

Thestartpointisdisplayedasabluecircle.

Replace Base Curve—Lets you replace the parent

curve. Click the button, then click the new surface

on which to base the la thed surface.

Ruled Surface

SelectNURBSobject. >Modifypanel>CreateSurfaces

rollout > Dependent Surfaces group box > Ruled

Select NURBS object. > Modify panel > NURBS toolbox >

Create Ruled S urface button

A ruled surface is generated from two curve

sub-objects. It lets you use curves to desig n the

two opposite borders of a surface.

Using two cur ves to create a ruled surface

You can animate the parent curves or their C Vs to

change the ruled surface.

Automatic Cur ve Attachment

When you create a ruled surface, you can select

curves that are not already sub-objects of the active

NURBS mo del. You can select another curve or

spline Splines object in the scene. When you select

that curve, it attaches to the current object as if you

hadusedtheAttach button (page 1–1120).

Wa rn in g : If the curve you attach is a sub-object of

anotherNURBSmodel,theentiremodel(thatis,the

curve’s parent NURBS object) is attached as well.

Asyoumovethemouseoveracurvethatisnot

part of the active NURBS object, the cursor

changes shape to indicate that you can pick the

curve, but the curve is not highlighted in blue.

Procedure

To create a r uled s urf ace:

In a NURBS object that contains at least

two curves, turn on Ruled.

2. Drag from one curve to the other.

You can also click first one curve, then the other.

A dependent surface is generated, using the

twocurvesasthesurface’soppositeedges.

The perpendicular edges are generated

automatically.

The Flip Normals control lets you flip the

surface normals at creation time. (After

creation, yo

ucanflipnormalsusingcontrolson

the Surface Common rollout.)