blob: 7ca27b70ef15361152e4f9576d8455eb3bf5fae2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
/* SPDX-License-Identifier: Apache-2.0
* Copyright 2011-2022 Blender Foundation */
#include "stdcycles.h"
shader node_light_falloff(float Strength = 0.0,
float Smooth = 0.0,
output float Quadratic = 0.0,
output float Linear = 0.0,
output float Constant = 0.0)
{
float ray_length = 0.0;
float strength = Strength;
getattribute("path:ray_length", ray_length);
if (Smooth > 0.0) {
float squared = ray_length * ray_length;
strength *= squared / (Smooth + squared);
}
/* Quadratic */
Quadratic = strength;
/* Linear */
Linear = (strength * ray_length);
/* Constant */
Constant = (strength * ray_length * ray_length);
}
|