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Cycles: Support user-defined shutter curve

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Previously shutter was instantly opening, staying opened for the shutter time
period of time and then instantly closing. This isn't quite how real cameras
are working, where shutter is opening with some curve. Now it is possible to
define user curve for how much shutter is opened across the sampling period
of time.

This could be used for example to make motion blur trails softer.
This commit is contained in:
Sergey Sharybin
2015-10-27 13:16:04 +05:00
parent c07c066685
commit 6a529e14f4
6 changed files with 65 additions and 10 deletions
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6
intern/cycles/util/util_math_cdf.cpp
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@@ -37,7 +37,7 @@ void util_cdf_invert(const int resolution,
float x = i / (float)half_size;
int index = upper_bound(cdf.begin(), cdf.end(), x) - cdf.begin();
float t;
if(index < cdf.size()) {
if(index < cdf.size() - 1) {
t = (x - cdf[index])/(cdf[index+1] - cdf[index]);
} else {
t = 0.0f;
@@ -49,11 +49,11 @@ void util_cdf_invert(const int resolution,
}
}
else {
for(int i = 0; i <= resolution; i++) {
for(int i = 0; i < resolution; i++) {
float x = from + range * (float)i * inv_resolution;
int index = upper_bound(cdf.begin(), cdf.end(), x) - cdf.begin();
float t;
if(index < cdf.size()) {
if(index < cdf.size() - 1) {
t = (x - cdf[index])/(cdf[index+1] - cdf[index]);
} else {
t = 0.0f;