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- /*
- * bump.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: bump.c,v 4.0 91/07/17 14:41:39 kolb Exp Locker: kolb $
- *
- * $Log: bump.c,v $
- * Revision 4.0 91/07/17 14:41:39 kolb
- * Initial version.
- *
- */
- #include "texture.h"
- #include "bump.h"
-
- /*
- * Create and return a reference to a "bump" texture.
- */
- Bump *
- BumpCreate(size)
- Float size;
- {
- Bump *bump;
-
- bump = (Bump *)RayMalloc(sizeof(Bump));
- bump->size = size;
- return bump;
- }
-
- /*
- * Apply a "bump" texture.
- */
- void
- BumpApply(bump, prim, ray, pos, norm, gnorm, surf)
- Bump *bump;
- Geom *prim;
- Ray *ray;
- Vector *pos, *norm, *gnorm;
- Surface *surf;
- {
- Vector disp;
-
- DNoise3(pos, &disp);
- norm->x += disp.x * bump->size;
- norm->y += disp.y * bump->size;
- norm->z += disp.z * bump->size;
- (void)VecNormalize(norm);
- }
-