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make stars fade in as sun drops below horizon

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ZappoMan 2015-05-11 16:32:27 -07:00
parent 73428ec12d
commit a2a1bf4e8c
1 changed files with 23 additions and 1 deletions
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24
interface/src/Application.cpp
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@ -3220,18 +3220,40 @@ void Application::displaySide(Camera& theCamera, bool selfAvatarOnly, RenderArgs
// compute starfield alpha based on distance from atmosphere
float alpha = 1.0f;
bool hasStars = true;
if (Menu::getInstance()->isOptionChecked(MenuOption::Atmosphere)) {
// TODO: handle this correctly for zones
const EnvironmentData& closestData = _environment.getClosestData(theCamera.getPosition());
if (closestData.getHasStars()) {
const float APPROXIMATE_DISTANCE_FROM_HORIZON = 0.1f;
const float DOUBLE_APPROXIMATE_DISTANCE_FROM_HORIZON = 0.2f;
glm::vec3 sunDirection = (getAvatarPosition() - closestData.getSunLocation())
/ closestData.getAtmosphereOuterRadius();
float height = glm::distance(theCamera.getPosition(), closestData.getAtmosphereCenter());
if (height < closestData.getAtmosphereInnerRadius()) {
// If we're inside the atmosphere, then determine if our keyLight is below the horizon
alpha = 0.0f;
if (sunDirection.y > -APPROXIMATE_DISTANCE_FROM_HORIZON) {
float directionY = glm::clamp(sunDirection.y,
-APPROXIMATE_DISTANCE_FROM_HORIZON, APPROXIMATE_DISTANCE_FROM_HORIZON)
+ APPROXIMATE_DISTANCE_FROM_HORIZON;
alpha = (directionY / DOUBLE_APPROXIMATE_DISTANCE_FROM_HORIZON);
}
} else if (height < closestData.getAtmosphereOuterRadius()) {
alpha = (height - closestData.getAtmosphereInnerRadius()) /
(closestData.getAtmosphereOuterRadius() - closestData.getAtmosphereInnerRadius());
if (sunDirection.y > -APPROXIMATE_DISTANCE_FROM_HORIZON) {
float directionY = glm::clamp(sunDirection.y,
-APPROXIMATE_DISTANCE_FROM_HORIZON, APPROXIMATE_DISTANCE_FROM_HORIZON)
+ APPROXIMATE_DISTANCE_FROM_HORIZON;
alpha = (directionY / DOUBLE_APPROXIMATE_DISTANCE_FROM_HORIZON);
}
}
} else {
hasStars = false;