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perlinNoise.I
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file perlinNoise.I
10 * @author drose
11 * @date 2005-10-05
12 */
13
14/**
15 * Returns a smooth interpolation spline from 0 .. 1 for t.
16 */
17INLINE double PerlinNoise::
18fade(double t) {
19 // return t * t * t * (t * (t * 6.0 - 15.0) + 10.0);
20 return (3.0 - 2.0 * t) * t * t;
21}
22
23/**
24 * Returns the smoothly lerped value from a to b.
25 */
26INLINE double PerlinNoise::
27lerp(double t, double a, double b) {
28 return a + t * (b - a);
29}
30
31/**
32 * Returns a unique seed value based on the seed value passed to this
33 * PerlinNoise object (and on its current state).
34 */
35INLINE unsigned long PerlinNoise::
36get_seed() {
37 return _randomizer.get_seed();
38}
unsigned long get_seed()
Returns a unique seed value based on the seed value passed to this PerlinNoise object (and on its cur...
Definition perlinNoise.I:36
unsigned long get_seed()
Returns a unique seed value based on the seed value passed to this Randomizer object (and on its curr...
Definition randomizer.I:82