VRML_CONE Procedure

Creates a VRML cone.

Usage

VRML_CONE

Input Parameters

None.

Keywords

Use these keywords to set the object properties and material properties.

Object Properties

The following keywords describe or define the VRML cone object.

Center—A 3-element array specifying the true center of the cone object. (Default: [0, 0, 0])

Height—Specifies the cone height (Default: 2.0)

Orientation—A 3-element array specifying the orientation of the cone (in the direction of the apex). (Default: cone axis orientation along y, with the apex at +y)

Radius—Specifies radius of the cone base from the y-axis. (Default: 1.0)

Transform—A 4-by-4 matrix containing the transformation to be applied to the cone object; similar to !P.T.

Material Properties

The following properties, when set, are applied to the object.

AmbientColor—3-element array of RGB color with each element ranging between 0 to 255. Scalar values are interpreted as grayscale.

DiffuseColor—A 3-element array of RGB color with each element ranging between 0 to 255. Scalar values are interpreted as grayscale.

EmissiveColor—A 3-element array of RGB color with each element ranging between 0 to 255. Scalar values are interpreted as grayscale.

Shininess—Scalar shininess factor, in the range from 0 to 255.

SpecularColor—A 3-element array of RGB color with each element ranging between 0 and 255. Scalar values are interpreted as grayscale.

Texture_Image—A texture image to apply to the object. The image is wrapped completely around the object. The texture image values and transparency values lie in the range of 0 to 255. There are four options:

(w, h) or (1, w, h)—Grayscale image

(2, w, h)—Grayscale in (0, *, *) plus transparency in (1, *, *)

(3, w, h)—True color image (red, green, blue)

(4, w, h)—True color plus transparency in (3, *, *)

Transparency—Scalar transparency factor, in the range of 0 to 255.

Discussion

The VRML_CONE procedure supports the cone node in VRML. The default cone has a base radius of 1.0 and a height of 2.0 such that it extends +1.0 and –1.0 in each direction from the object center.

Example

The 'wavelogo.dat' file used in this example is found in the following directory:

<wavedir>/demo/web/vrml

<wavedir>\demo\web\vrml

where <wavedir> is the main PV‑WAVE directory.

VRML_OPEN, 'vrml_cone.wrl'

x = [0, 1, 2, 3, 4]

y = [0, 1, 0, 1, 0]

z = [4, 3, 2, 1, 0]

RESTORE, 'wavelogo.dat' ; img, r, g, b

sz = SIZE(img)

col = TRANSPOSE([[r], [g], [b]])

img24 = REFORM(col(*, img), 3, sz(1), sz(2))

; Create texture and default cone.

VRML_CONE

VRML_CONE,Center = [0, 3, 0], Radius = .4, $

   Height = 4.0, Texture = img24

; Create and view the textured cone.

VRML_CONE,Center = [2, 0, 0], Radius = 1.4, Height = 1.2, $

   DiffuseColor = [127, 255, 191], AmbientColor = [55, 70, 60], $

   SpecularColor = [0, 100, 0]

VRML_CLOSE