SPHERE Function

Defines a spherical object that can be used by the RENDER function.

result = SPHERE( )

None.

result A structure that defines an ellipsoidal object.

Color A 256-element double-precision floating-point vector containing the color (intensity) coefficients of the object.(Default: Color(*)=1.0) For more information, see Defining Color and Shading in Chapter 7 of the PV-WAVE User's Guide.

Decal A 2D array of bytes whose elements correspond to indices into the arrays of material properties. For more information, see Decals in Chapter 7 of the PV-WAVE User's Guide.

Kamb A 256-element double-precision floating-point vector containing the ambient (flat shaded) coefficients. (Default: Kamb(*)=0.0) For more information, see Ambient Component in Chapter 7 of the PV-WAVE User's Guide.

Kdiff A 256-element double-precision floating-point vector containing the diffuse reflectance coefficients. (Default: Kdiff(*)=1.0) For more information, see Diffuse Component in Chapter 7 of the PV-WAVE User's Guide.

Ktran A 256-element double-precision floating-point vector containing the specular transmission coefficients.(Default: Ktran(*)=0.0) For more information, see Transmission Component in Chapter 7 of the PV-WAVE User's Guide.

Transform A 4-by-4 double-precision floating-point array containing the local transformation matrix whose default is the identity matrix. For more information, see Setting Object and View Transformations in Chapter 7 of the PV-WAVE User's Guide.

A SPHERE is used by the RENDER function to render ellipsoid objects, such as for spherical inverse mapping or molecular modeling (atoms). It is centered at the origin, with a radius of 0.5.

You can alter its diameter and orientation with the Transform keyword.

ds = 6
checks = BYTARR(ds, ds)
checks(*) = 255
FOR x=0, ds - 1 DO $
    FOR y=0, ds - 1 DO $
          IF ((x mod 2) EQ (y mod 2)) THEN $
                  checks(x, y) = 128

; Create a 6-by-6 checkerboard image.

two = FLTARR(256)
two(128) = 0.5 & two(255) = 1.0

; Set checks to be full and one-half intensity.

s = SPHERE(Decal=checks, Color=two)
TV, RENDER(s)

; Render the sphere with the checkerboard decal mapped on.

CONE, CYLINDER, MESH, RENDER, VOLUME

For more information, see Ray-tracing in Chapter 7 of the PV-WAVE User's Guide.