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windy.c
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C/C++ Source or Header
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1991-08-08
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2KB
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70 lines
/*
* windy.c
*
* Copyright (C) 1989, 1991, Craig E. Kolb
* All rights reserved.
*
* This software may be freely copied, modified, and redistributed
* provided that this copyright notice is preserved on all copies.
*
* You may not distribute this software, in whole or in part, as part of
* any commercial product without the express consent of the authors.
*
* There is no warranty or other guarantee of fitness of this software
* for any purpose. It is provided solely "as is".
*
* $Id: windy.c,v 4.0 91/07/17 14:44:25 kolb Exp Locker: kolb $
*
* $Log: windy.c,v $
* Revision 4.0 91/07/17 14:44:25 kolb
* Initial version.
*
*/
#include "texture.h"
#include "windy.h"
/*
* Create and return a reference to a "windy" texture.
*/
WindyText *
WindyCreate(scale, wscale, cscale, bscale, octaves, tscale, hscale, offset)
Float scale, wscale, cscale, bscale, tscale, hscale, offset;
int octaves;
{
WindyText *windy;
windy = (WindyText *)Malloc(sizeof(WindyText));
windy->scale = scale;
windy->windscale = wscale;
windy->chaoscale = cscale;
windy->bumpscale = bscale;
windy->tscale = tscale;
windy->hscale = hscale;
windy->offset = offset;
windy->octaves = octaves;
return windy;
}
/*
* Apply a "windy" texture.
*/
void
WindyApply(windy, prim, ray, pos, norm, gnorm, surf)
WindyText *windy;
Geom *prim;
Ray *ray;
Vector *pos, *norm, *gnorm;
Surface *surf;
{
Vector bump;
Windy(pos, windy->windscale, windy->chaoscale, windy->bumpscale,
windy->octaves, windy->tscale, windy->hscale, windy->offset,
&bump);
norm->x += windy->scale * bump.x;
norm->y += windy->scale * bump.y;
norm->z += windy->scale * bump.z;
VecNormalize(norm);
}