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change flickering light's brightness pattern

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actorid
Nathan Jeffords 12 years ago
parent 043e6c09fe
commit 0f3712f284
2 changed files with 87 additions and 60 deletions
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134
apps/openmw/mwrender/objects.cpp
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@ -235,8 +235,9 @@ void Objects::insertLight (const MWWorld::Ptr& ptr, float r, float g, float b, f
else
info.type = LT_Normal;
// random starting phase for the animation
info.time = Ogre::Math::RangeRandom(0, 2 * Ogre::Math::PI);
// randomize lights animations
info.time = Ogre::Math::RangeRandom(-500, +500);
info.phase = Ogre::Math::RangeRandom(-500, +500);
// adjust the lights depending if we're in an interior or exterior cell
// quadratic means the light intensity falls off quite fast, resulting in a
@ -373,6 +374,48 @@ void Objects::disableLights()
}
}
namespace pulse
{
static float frequency (float x)
{
return x;
}
static float amplitude (float phase)
{
return sin (phase);
}
}
namespace flicker
{
static const float fa = 0.785398f;
static const float fb = 1.17024f;
static const float tdo = 0.94f;
static const float tdm = 2.48f;
static const float f [3] = { 1.5708f, 4.18774f, 5.19934f };
static const float o [3] = { 0.804248f, 2.11115f, 3.46832f };
static const float m [3] = { 1.0f, 0.785f, 0.876f };
static const float s = 0.394f;
static const float phase_wavelength = 120.0f * 3.14159265359f / fa;
static float frequency (float x)
{
return tdo + tdm * sin (fa * x);
}
static float amplitude (float x)
{
float v = 0.0f;
for (int i = 0; i < 3; ++i)
v += sin (fb*x*f[i] + o[1])*m[i];
return v * s;
}
}
void Objects::update(const float dt)
{
std::vector<LightInfo>::iterator it = mLights.begin();
@ -382,77 +425,64 @@ void Objects::update(const float dt)
{
Ogre::Light* light = mMwRoot->getCreator()->getLight(it->name);
// Light animation (pulse & flicker)
it->time += dt;
const float phase = std::fmod(static_cast<double> (it->time), static_cast<double>(32 * 2 * Ogre::Math::PI)) * 20;
float pulseConstant;
float brightness;
float cycle_time;
float time_distortion;
if ((it->type == LT_Pulse) && (it->type == LT_PulseSlow))
{
cycle_time = 2 * Ogre::Math::PI;
time_distortion = 20.0f;
}
else
{
cycle_time = 500.0f;
it->phase = fmod (it->phase + dt, flicker::phase_wavelength);
time_distortion = flicker::frequency (it->phase);
}
it->time += it->dir*dt*time_distortion;
if (it->dir > 0 && it->time > +cycle_time)
{
it->dir = -1.0f;
it->time = +2*cycle_time - it->time;
}
if (it->dir < 0 && it->time < -cycle_time)
{
it->dir = +1.0f;
it->time = -2*cycle_time - it->time;
}
static const float fast = 4.0f/1.0f;
static const float slow = 1.0f/1.0f;
// These formulas are just guesswork, but they work pretty well
if (it->type == LT_Normal)
{
// Less than 1/255 light modifier for a constant light:
pulseConstant = (const float)(1.0 + sin(phase) / 255.0 );
brightness = (const float)(1.0 + flicker::amplitude(it->time*slow) / 255.0 );
}
else if (it->type == LT_Flicker)
{
// Let's do a 50% -> 100% sine wave pulse over 1 second:
// This is 75% +/- 25%
pulseConstant = (const float)(0.75 + sin(phase) * 0.25);
// Then add a 25% flicker variation:
it->resetTime -= dt;
if (it->resetTime < 0)
{
it->flickerVariation = (rand() % 1000) / 1000 * 0.25;
it->resetTime = 0.5;
}
if (it->resetTime > 0.25)
{
pulseConstant = (pulseConstant+it->flickerVariation) * (1-it->resetTime * 2.0f) + pulseConstant * it->resetTime * 2.0f;
}
else
{
pulseConstant = (pulseConstant+it->flickerVariation) * (it->resetTime * 2.0f) + pulseConstant * (1-it->resetTime * 2.0f);
}
brightness = (const float)(0.75 + flicker::amplitude(it->time*fast) * 0.25);
}
else if (it->type == LT_FlickerSlow)
{
// Let's do a 50% -> 100% sine wave pulse over 1 second:
// This is 75% +/- 25%
pulseConstant = (const float)(0.75 + sin(phase / 4.0) * 0.25);
// Then add a 25% flicker variation:
it->resetTime -= dt;
if (it->resetTime < 0)
{
it->flickerVariation = (rand() % 1000) / 1000 * 0.25;
it->resetTime = 0.5;
}
if (it->resetTime > 0.5)
{
pulseConstant = (pulseConstant+it->flickerVariation) * (1-it->resetTime) + pulseConstant * it->resetTime;
}
else
{
pulseConstant = (pulseConstant+it->flickerVariation) * (it->resetTime) + pulseConstant * (1-it->resetTime);
}
brightness = (const float)(0.75 + flicker::amplitude(it->time*slow) * 0.25);
}
else if (it->type == LT_Pulse)
{
// Let's do a 75% -> 125% sine wave pulse over 1 second:
// This is 100% +/- 25%
pulseConstant = (const float)(1.0 + sin(phase) * 0.25);
brightness = (const float)(1.0 + pulse::amplitude (it->time*fast) * 0.25);
}
else if (it->type == LT_PulseSlow)
{
// Let's do a 75% -> 125% sine wave pulse over 1 second:
// This is 100% +/- 25%
pulseConstant = (const float)(1.0 + sin(phase / 4.0) * 0.25);
brightness = (const float)(1.0 + pulse::amplitude (it->time*slow) * 0.25);
}
else
assert(0 && "Invalid light type");
light->setDiffuseColour( it->colour * pulseConstant );
light->setDiffuseColour(it->colour * brightness);
++it;
}

13
apps/openmw/mwrender/objects.hpp
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@ -34,16 +34,13 @@ struct LightInfo
LightType type;
// Runtime variables
float flickerVariation; // 25% flicker variation, reset once every 0.5 seconds
float flickerSlowVariation; // 25% flicker variation, reset once every 1.0 seconds
float resetTime;
long double time;
float dir; // direction time is running...
float time; // current time
float phase; // current phase
LightInfo() :
flickerVariation(0), resetTime(0.5),
flickerSlowVariation(0), time(0), interior(true),
type(LT_Normal), radius(1.0)
dir(1.0f), time(0.0f), phase (0.0f),
interior(true), type(LT_Normal), radius(1.0)
{
}
};

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