Extrude Object: Caps and Rounding

Manual Reference Objects NURBS Extrude Object

Caps and Rounding

Start
End

Change the rounding at the start of the NURBS object. If you set Cap And Rounding for start, you can set the following parameters:

Change the rounding at the end of the NURBS object. If you set Cap And Rounding for End, you can set the following parameters:

Steps [1..100]

Here you enter the number of subdivisions for the rounding at the start of the object.

Radius [0..10000000m]

Determines the radius of the rounding at the start of the object.

Steps [1..100]

The number of subdivisions for the rounding at the end of the object.

Radius [0..10000000m]

The radius of the rounding at the end of the object.

Fillet Type

Choose the shape of the rounding from this drop-down list. When the constrained mode is active, all fillet types except the Engraved type extend the length of the extrusion of the NURBS object.

1. 1 Step 2. 2 Steps 3. Engraved 4. Linear 5. Convex 6. Concave 7. Half Circle

Phong Angle [0..180°]

Defines the smoothing angle between adjacent polygons that are part of the fillet.

Hull Inwards
Hole Inwards

The examples below demonstrate rounding inwards and rounding outwards. Hole Inwards refers to hole segments — it is ignored if the spline has no hole segments.

Constrain

This setting determines whether the object’s dimensions are preserved or whether the object should be inflated by the rounding.

The thick line represents the initial spline

Keep the following in mind when rounding with the Constrain option enabled. The pictures below demonstrate this issue. The top picture shows the initial contour. Rounding the contour with a small radius produces the desired result (center picture). The final picture shows what happens if the rounding is set too high. CINEMA 4D cannot detect inappropriate settings for you in this case. It is up to you to use a sensible rounding radius. Rounding objects by inflating them always works, although it does increase the size of the hull.

Type

Use this setting to define if the caps should consist of triangles, quads or n-gons.

Regular Grid
Width [0.01..10000000m]

This option is especially useful if you intend to use deformation objects. If enabled the surface will not be built out of long triangles but out of regularly-spaced quadrangles whose size you can enter into the Width box.

Initially there appears to be no difference at all between the enabled and disabled option when you render or shade. However, if you disable the option and deform the spline so that it is no longer planar, artefacts will appear on the surface. The long triangles are now visible.

You can reduce the artefacts by enabling the option. Although triangles will still be created at the edge, the quadrangles become smaller the more subdivisions you use, leading to fewer triangles.