func sparkParticles() *effects.ParticleSystem {
img, _ := assets.ImportImageCached("TestAssets/Spark.png")
smoke := effects.CreateParticleSystem(effects.ParticleSettings{
MaxParticles: 7,
ParticleEmitRate: 7,
BaseGeometry: renderer.CreateBox(float32(1), float32(1)),
TotalFrames: 1,
FramesX: 1,
FramesY: 1,
MaxLife: 1.0,
MinLife: 0.7,
StartColor: color.NRGBA{255, 220, 180, 255},
EndColor: color.NRGBA{255, 155, 55, 255},
StartSize: mgl32.Vec3{1, 1, 1}.Mul(0.008),
EndSize: mgl32.Vec3{1, 1, 1}.Mul(0.005),
MinTranslation: mgl32.Vec3{1, 1, 1}.Mul(-0.04),
MaxTranslation: mgl32.Vec3{1, 1, 1}.Mul(0.04),
MinStartVelocity: mgl32.Vec3{-0.5, 0.0, -0.5},
MaxStartVelocity: mgl32.Vec3{0.5, 1.0, 0.5},
Acceleration: mgl32.Vec3{0.0, -1.0, 0.0},
OnParticleUpdate: func(p *effects.Particle) {
p.Scale[0] = p.Scale[0] * (1 + p.Velocity.Len()*3.5)
p.Orientation = mgl32.QuatBetweenVectors(mgl32.Vec3{1, 0, 0}, p.Velocity)
},
})
smoke.Node.Material = renderer.NewMaterial(renderer.NewTexture("diffuseMap", img, false))
return smoke
}
func sparkParticles() *effects.ParticleGroup {
img, _ := assets.ImportImageCached("resources/spark.png")
material := renderer.NewMaterial(renderer.NewTexture("diffuseMap", img, false))
particleSystem := effects.CreateParticleSystem(effects.ParticleSettings{
MaxParticles: 80,
ParticleEmitRate: 400,
BaseGeometry: renderer.CreateBox(float32(1), float32(1)),
TotalFrames: 1,
FramesX: 1,
FramesY: 1,
MaxLife: 3.3,
MinLife: 1.7,
StartColor: color.NRGBA{254, 160, 90, 254},
EndColor: color.NRGBA{254, 160, 90, 254},
StartSize: mgl32.Vec2{2, 2}.Vec3(0),
EndSize: mgl32.Vec2{2, 2}.Vec3(0),
MinTranslation: mgl32.Vec2{-5, -5}.Vec3(0),
MaxTranslation: mgl32.Vec2{5, 5}.Vec3(0),
MinStartVelocity: mgl32.Vec2{-100, -100}.Vec3(0),
MaxStartVelocity: mgl32.Vec2{100, 100}.Vec3(0),
Acceleration: mgl32.Vec2{0, 400}.Vec3(0),
OnParticleUpdate: func(p *effects.Particle) {
p.Scale[0] = p.Scale[0] * (1 + p.Velocity.Len()*0.05)
p.Orientation = mgl32.QuatBetweenVectors(mgl32.Vec3{1, 0, 0}, p.Velocity)
},
})
particleSystem.FaceCamera = false
particleGroup := effects.NewParticleGroup(nil, particleSystem)
particleGroup.Node.Material = material
return particleGroup
}
//FacingOrientation - return an orientation that always faces the given direction with rotation
func FacingOrientation(rotation float32, direction, normal, tangent mgl32.Vec3) mgl32.Quat {
betweenVectorsQ := mgl32.QuatBetweenVectors(normal, direction)
angleQ := mgl32.QuatRotate(rotation, normal)
orientation := betweenVectorsQ.Mul(angleQ)
return orientation
}