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Billboarding on sprites

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This commit is contained in:
Stiffly
2014-05-07 21:34:19 +02:00
parent 398b157b89
commit 1a365bf069
6 changed files with 90 additions and 43 deletions
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src/Systems/ParticleSystem.cpp
+58 -28
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@@ -31,6 +31,9 @@ void Systems::ParticleSystem::UpdateEntity(double dt, EntityID entity, EntityID
emitterComponent->TimeSinceLastSpawn = 0;
}
std::list<ParticleData>::iterator it;
for(it = m_ParticleEmitter[entity].begin(); it != m_ParticleEmitter[entity].end();)
{
@@ -55,19 +58,35 @@ void Systems::ParticleSystem::UpdateEntity(double dt, EntityID entity, EntityID
// Velocity interpolation
if(particleComponent->VelocitySpectrum.size() > 1)
VectorInterpolation(timeProgress, particleComponent->VelocitySpectrum, transformComponent->Velocity);
// Angular velocity interpolation
if(particleComponent->AngularVelocitySpectrum.size() > 1)
ScalarInterpolation(timeProgress, particleComponent->AngularVelocitySpectrum, it->AngularVelocity);
if (particleComponent->AngularVelocitySpectrum.size() != 0)
{
if(particleComponent->AngularVelocitySpectrum.size() > 1)
{
ScalarInterpolation(timeProgress, particleComponent->AngularVelocitySpectrum, it->AngularVelocity);
transformComponent->Orientation = glm::angleAxis(it->AngularVelocity, it->Orientation);
}
else
{
transformComponent->Orientation *= glm::angleAxis(it->AngularVelocity, it->Orientation);
//it->Orientation = glm::angleAxis(it->AngularVelocity, it->Orientation);
}
}
//Angular velocity interpolation
if(particleComponent->OrientationSpectrum.size() > 1)
{
VectorInterpolation(timeProgress, particleComponent->OrientationSpectrum, it->Orientation);
glm::vec3 v1 = (particleComponent->OrientationSpectrum[0]);
glm::vec3 v2 = (it->Orientation);
glm::vec3 v3 = glm::normalize(glm::cross(v1,v2));
float angle = glm::acos(glm::dot(v1, v2) / (glm::length(v1) * glm::length(v2)));
transformComponent->Orientation = glm::angleAxis(angle, v3);
}
glm::vec3 v1 = (particleComponent->OrientationSpectrum[0]);
glm::vec3 v2 = (it->Orientation);
glm::vec3 v3 = glm::normalize(glm::cross(v1,v2));
float angle = glm::acos(glm::dot(v1, v2) / (glm::length(v1) * glm::length(v2)));
transformComponent->Orientation = glm::angleAxis(angle, v3);
transformComponent->Position += transformComponent->Velocity * (float)dt;
it++;
@@ -98,8 +117,8 @@ void Systems::ParticleSystem::SpawnParticles(EntityID emitterID)
auto particleTransform = m_World->GetComponent<Components::Transform>(ent, "Transform");
particleTransform->Position = emitterTransform->Position;
particleTransform->Scale = glm::vec3(1, 1, 1);
particleTransform->Orientation = emitterOrientation;
//The emitter's orientation as "start value" times the default direction for emitter. Times the speed, and then rotate on x and y axis with the randomized spread angle.
float spreadAngle = emitterComponent->SpreadAngle;
particleTransform->Velocity = emitterOrientation * glm::vec3(0, 0, -1) * speed *
@@ -107,33 +126,44 @@ void Systems::ParticleSystem::SpawnParticles(EntityID emitterID)
glm::normalize(glm::angleAxis(RandomizeAngle(spreadAngle), glm::vec3(0, 1, 0))) *
glm::normalize(glm::angleAxis(RandomizeAngle(spreadAngle), glm::vec3(0, 0, 1)));
glm::vec3 testVel = glm::vec3(particleTransform->Velocity.x, -particleTransform->Velocity.y * 1.5, particleTransform->Velocity.z); //TEMP
auto particle = m_World->AddComponent<Components::Particle>(ent, "Particle");
particle->LifeTime = emitterComponent->LifeTime;
particle->ScaleSpectrum = emitterComponent->ScaleSpectrum; //TEMP
//particle->ScaleSpectrum.push_back(glm::vec3(1,4,1)); //TEMP
particle->VelocitySpectrum.push_back(particleTransform->Velocity); //TEMP
particle->VelocitySpectrum.push_back(testVel); //TEMP
// particle->AngularVelocitySpectrum.push_back(0.f);
// particle->AngularVelocitySpectrum.push_back(-glm::pi<float>());
particle->OrientationSpectrum = particle->VelocitySpectrum;
// particle->OrientationSpectrum.push_back(glm::vec3(0,1,0));
// particle->OrientationSpectrum.push_back(glm::vec3(0,-1,0));
// Color startColor = {.4f, .45f, .2f};
// particle->ColorSpectrum.push_back(startColor);
// Color endColor = {0.f, 45.f, 23.f};
// particle->ColorSpectrum.push_back(endColor);
particle->ScaleSpectrum = emitterComponent->ScaleSpectrum;
particle->VelocitySpectrum.push_back(particleTransform->Velocity);
if (emitterComponent->ScaleSpectrum.size() > 0)
{
if (emitterComponent->ScaleSpectrum.size() > 1)
{
particle->ScaleSpectrum = emitterComponent->ScaleSpectrum;
}
else
{
particleTransform->Scale = emitterComponent->ScaleSpectrum[0];
}
}
else
{
particleTransform->Scale = glm::vec3(1, 1, 1);
}
if(emitterComponent->UseGoalVelocity)
particle->VelocitySpectrum.push_back(emitterComponent->GoalVelocity);
particle->OrientationSpectrum = emitterComponent->OrientationSpectrum;
if(particle->OrientationSpectrum.size() != 0)
particleTransform->Orientation = glm::angleAxis(0.f, particle->OrientationSpectrum[0]);
particle->AngularVelocitySpectrum = emitterComponent->AngularVelocitySpectrum;
ParticleData data;
data.ParticleID = ent;
data.SpawnTime = glfwGetTime();
//data.AngularVelocity = particle->AngularVelocitySpectrum[0];
data.Orientation = particle->OrientationSpectrum[0];
if (particle->AngularVelocitySpectrum.size() != 0)
data.AngularVelocity = particle->AngularVelocitySpectrum[0];
if (particle->OrientationSpectrum.size() != 0)
data.Orientation = particle->OrientationSpectrum[0];
else data.Orientation = emitterOrientation * glm::vec3(0,0,-1);
m_ParticleEmitter[emitterID].push_back(data);
}
}