4.5.3 Geometry, Matrices and Colors
- float xcomp ( point Pt )
-
- float ycomp ( point Pt )
-
- float zcomp ( point Pt )
-
- void setxcomp ( output point Pt; float x )
-
- void setycomp ( output point Pt; float y )
-
- void setzcomp ( output point Pt; float z )
-
- float comp ( matrix M; float row, col )
-
Returns
M[row,col]
.
- void setcomp ( output matrix M; float row, col, x )
-
M[row,col]
= x.
- float comp ( color c; float i )
-
- void setcomp ( output color c, float i, x )
-
- point transform ( string [fromspace,] tospace; point Pt )
-
- point transform ( [string fromspace;] matrix M; point Pt )
-
- vector vtransform ( string [fromspace,] tospace; vector V )
-
- vector vtransform ( [string fromspace;] matrix M; vector V )
-
- normal ntransform ( string [fromspace,] tospace; normal Nr )
-
- normal ntransform ( [string fromspace;] matrix M; normal Nr )
-
Transform a
point
, vector
or normal
from some given space (fromspace) to another space (tospace). If the optional fromspace is not given, it is assumed to be the `current' space.
- color ctransform ( string [fromspace,] tospace; color src_color )
-
Transforms color src_color from color space fromspace to color space tospace. If the optional fromspace is not specified, it is assumed to be `rgb'. 3Delight knows about the following color spaces: RGB, HSV, HSL, YIQ and XYZ(18). If an unknown color space is given, 3Delight will return src_color.
- float distance ( point Pt1, Pt2 )
-
- float length ( vector V )
-
- vector normalize ( vector V )
-
- float ptlined ( point Pt1, Pt2, Q )
-
Returns minimum distance between a point Q and a line segment defined by Pt1, Pt2.
- point rotate ( point Q; float angle; point Pt1, Pt2 )
-
Rotates a point Q around the line defined by Pt1, Pt2 by a given angle. New point position is returned. Note that angle is assumed to be in radians.
- float area ( point Pt )
-
Returns
length(Du(Pt)^Dv(Pt))
, which is approximatly the area of one micro-polygon on the surface defined by Pt.
- vector faceforward ( vector N, I[, Nref] )
-
Flip N, if needed, so it faces in the direction opposite to I. Nref gives the element surface normal; if not provided, NRef will be set to Ng.
- vector reflect ( vector I, N )
-
- vector refract ( vector I, Nr; float eta )
-
Returns the refracted vector for the incoming vector I, surface normal Nr and index of refraction ratio eta.
- float depth ( point Pt )
-
Returns the normalized z coordinate of Pt in camera space. Return value is in the range [0..1] (0=near clipping plane, 1=far clipping plane). Pt is assumed to be defined in `current' space.
- normal calculatenormal ( point Pt )
-
Use this function to compute the normal of a surface defined by Pt. Often used after a displacement operation. Equivalent to
Du(Pt)^Dv(Pt)
, but faster.
- float determinent ( matrix M )
-
- matrix translate ( matrix M; point Tr )
-
- matrix rotate ( matrix M; float angle; vector axis )
-
- matrix scale ( matrix M; point Sc )
-
Basic matrix operations. The angle parameter passed to
rotate()
is assumed to be in radians.
This document was generated
by Aghiles Kheffache on July, 31 2003
using texi2html
3Delight 1.0.0. Copyright 2000-2003 The 3Delight Team.
All Rights Reserved.