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Stars a bit dimmer, have horizon

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Philip Rosedale 2013-12-03 23:01:13 -08:00
parent b04d48a7b8
commit 2dfbaf605e
1 changed files with 18 additions and 9 deletions
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27
interface/src/starfield/Generator.cpp
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@ -24,22 +24,24 @@ void Generator::computeStarPositions(InputVertices& destination, unsigned limit,
vertices->clear();
vertices->reserve(limit);
const unsigned MILKY_WAY_WIDTH = 16.0; // width in degrees of one half of the Milky Way
const float MILKY_WAY_INCLINATION = 30.0f; // angle of Milky Way from horizontal in degrees
const float MILKY_WAY_RATIO = 0.6;
const unsigned MILKY_WAY_WIDTH = 12.0; // width in degrees of one half of the Milky Way
const float MILKY_WAY_INCLINATION = 0.0f; // angle of Milky Way from horizontal in degrees
const float MILKY_WAY_RATIO = 0.4;
const unsigned NUM_DEGREES = 360;
for(int star = 0; star < floor(limit * (1 - MILKY_WAY_RATIO)); ++star) {
float azimuth, altitude;
azimuth = (((float)rand() / (float) RAND_MAX) * NUM_DEGREES) - (NUM_DEGREES / 2);
altitude = (acos((2.0f * ((float)rand() / (float)RAND_MAX)) - 1.0f) / PI_OVER_180) + 90;
vertices->push_back(InputVertex(azimuth, altitude, computeStarColor(STAR_COLORIZATION)));
}
for(int star = 0; star < ceil(limit * MILKY_WAY_RATIO); ++star) {
float azimuth = ((float)rand() / (float) RAND_MAX) * NUM_DEGREES;
float altitude = asin((float)rand() / (float) RAND_MAX * 2 - 1) * MILKY_WAY_WIDTH;
float altitude = powf(randFloat()*0.5f, 2.f)/0.25f * MILKY_WAY_WIDTH;
if (randFloat() > 0.5f) {
altitude *= -1.f;
}
// we need to rotate the Milky Way band to the correct orientation in the sky
// convert from spherical coordinates to cartesian, rotate the point and then convert back.
@ -71,8 +73,15 @@ void Generator::computeStarPositions(InputVertices& destination, unsigned limit,
// 0 = completely black & white
// 1 = very colorful
unsigned Generator::computeStarColor(float colorization) {
unsigned char red = rand() % 256;
unsigned char green = round((red * (1 - colorization)) + ((rand() % 256) * colorization));
unsigned char blue = round((red * (1 - colorization)) + ((rand() % 256) * colorization));
return red | green << 8 | blue << 16;
unsigned char red, green, blue;
if (randFloat() < 0.3f) {
// A few stars are colorful
red = 2 + (rand() % 254);
green = 2 + round((red * (1 - colorization)) + ((rand() % 254) * colorization));
blue = 2 + round((red * (1 - colorization)) + ((rand() % 254) * colorization));
} else {
// Most stars are dimmer and white
red = green = blue = 2 + (rand() % 128);
}
return red | (green << 8) | (blue << 16);
}