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light.go
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package tetra3d
import (
"github.com/solarlune/tetra3d/math32"
)
// ILight represents an interface that is fulfilled by an object that emits light, returning the color a vertex should be given that Vertex and its model matrix.
typeILightinterface {
INode
// beginRender is used to call any set-up code or to prepare math structures that are used when lighting the scene.
// It gets called once when first rendering a set of Nodes.
beginRender()
// beginModel is, similarly to beginRender(), used to prepare or precompute any math necessary when lighting the scene.
// It gets called once before lighting all visible triangles of a given Model.
beginModel(model*Model)
Light(meshPart*MeshPart,model*Model,targetColorsVertexColorChannel,onlyVisiblebool)// Light lights the triangles in the MeshPart, storing the result in the targetColors
// color buffer. If onlyVisible is true, only the visible vertices will be lit; if it's false, they will all be lit.
IsOn()bool// isOn is simply used tfo tell if a "generic" Light is on or not.
SetOn(onbool)// SetOn sets whether the light is on or not
Color()Color
SetColor(cColor)
Energy()float32
SetEnergy(energyfloat32)
}
//---------------//
// AmbientLight represents an ambient light that colors the entire Scene.
typeAmbientLightstruct {
*Node
colorColor// Color is the color of the PointLight.
// energy is the overall energy of the Light. Internally, technically there's no difference between a brighter color and a
// higher energy, but this is here for convenience / adherance to GLTF / 3D modelers.
energyfloat32
onbool// If the light is on and contributing to the scene.
result [3]float32
}
// NewAmbientLight returns a new AmbientLight.
funcNewAmbientLight(namestring,r,g,b,energyfloat32)*AmbientLight {
amb:=&AmbientLight{
Node:NewNode(name),
color:NewColor(r,g,b,1),
energy:energy,
on:true,
}
amb.owner=amb
returnamb
}
func (amb*AmbientLight)Clone()INode {
clone:=NewAmbientLight(amb.name,amb.color.R,amb.color.G,amb.color.B,amb.energy)
clone.on=amb.on
clone.Node=amb.Node.clone(clone).(*Node)
ifrunCallbacks&&clone.Callbacks().OnClone!=nil {
clone.Callbacks().OnClone(clone)
}
returnclone
}
func (amb*AmbientLight)beginRender() {
amb.result= [3]float32{amb.color.R*amb.energy,amb.color.G*amb.energy,amb.color.B*amb.energy}
}
func (amb*AmbientLight)beginModel(model*Model) {}
// Light returns the light level for the ambient light. It doesn't use the provided Triangle; it takes it as an argument to simply adhere to the Light interface.
func (amb*AmbientLight)Light(meshPart*MeshPart,model*Model,targetColorsVertexColorChannel,onlyVisiblebool) {
meshPart.ForEachVertexIndex(func(vertIndexint) {
targetColors[vertIndex].R+=amb.result[0]
targetColors[vertIndex].G+=amb.result[1]
targetColors[vertIndex].B+=amb.result[2]
},onlyVisible)
}
func (amb*AmbientLight)IsOn()bool {
returnamb.on&&amb.energy>0
}
func (amb*AmbientLight)SetOn(onbool) {
amb.on=on
}
func (amb*AmbientLight)Color()Color {
returnamb.color
}
func (amb*AmbientLight)SetColor(colorColor) {
amb.color=color
}
func (amb*AmbientLight)Energy()float32 {
returnamb.energy
}
func (amb*AmbientLight)SetEnergy(energyfloat32) {
amb.energy=energy
}
// Type returns the NodeType for this object.
func (amb*AmbientLight)Type()NodeType {
returnNodeTypeAmbientLight
}
//---------------//
// PointLight represents a point light (naturally).
typePointLightstruct {
*Node
// Range represents the distance after which the light fully attenuates. If this is 0 (the default),
// it falls off using something akin to the inverse square law.
Rangefloat32
// color is the color of the PointLight.
colorColor
// energy is the overall energy of the Light, with 1.0 being full brightness. Internally, technically there's no
// difference between a brighter color and a higher energy, but this is here for convenience / adherance to the
// GLTF spec and 3D modelers.
energyfloat32
// If the light is on and contributing to the scene.
Onbool
rangeSquaredfloat32
workingPositionVector3
}
// NewPointLight creates a new Point light.
funcNewPointLight(namestring,r,g,b,energyfloat32)*PointLight {
point:=&PointLight{
Node:NewNode(name),
energy:energy,
color:NewColor(r,g,b,1),
On:true,
}
point.owner=point
returnpoint
}
// Clone returns a new clone of the given point light.
func (p*PointLight)Clone()INode {
clone:=NewPointLight(p.name,p.color.R,p.color.G,p.color.B,p.energy)
clone.On=p.On
clone.Range=p.Range
clone.Node=p.Node.clone(clone).(*Node)
ifrunCallbacks&&clone.Callbacks().OnClone!=nil {
clone.Callbacks().OnClone(clone)
}
returnclone
}
func (p*PointLight)beginRender() {
p.rangeSquared=p.Range*p.Range
}
func (p*PointLight)beginModel(model*Model) {
pos,sca,rot:=model.Transform().Inverted().Decompose()
// Rather than transforming all vertices of all triangles of a mesh, we can just transform the
// point light's position by the inversion of the model's transform to get the same effect and save processing time.
// The same technique is used for Sphere - Triangle collision in bounds.go.
ifmodel.skinned {
p.workingPosition=p.WorldPosition()
}else {
p.workingPosition=rot.MultVec(p.WorldPosition()).Add(pos.Mult(Vector3{1/sca.X,1/sca.Y,1/sca.Z}))
}
}
// Light returns the R, G, and B values for the PointLight for all vertices of a given Triangle.
func (p*PointLight)Light(meshPart*MeshPart,model*Model,targetColorsVertexColorChannel,onlyVisiblebool) {
// We calculate both the eye vector as well as the light vector so that if the camera passes behind the
// lit face and backface culling is off, the triangle can still be lit or unlit from the other side. Otherwise,
// if the triangle were lit by a light, it would appear lit regardless of the positioning of the camera.
meshPart.ForEachVertexIndex(func(indexint) {
// TODO: Make lighting faster by returning early if the triangle is too far from the point light position
varvertPos,vertNormalVector3
ifmodel.skinned {
vertPos=model.Mesh.vertexSkinnedPositions[index]
vertNormal=model.Mesh.vertexSkinnedNormals[index]
}else {
vertPos=model.Mesh.VertexPositions[index]
vertNormal=model.Mesh.VertexNormals[index]
}
distance:=p.workingPosition.DistanceSquaredTo(vertPos)
ifp.Range>0 {
ifdistance>p.rangeSquared {
return
}
// var triCenter Vector
// if model.skinned {
// v0 := model.Mesh.vertexSkinnedPositions[tri.VertexIndices[0]].Clone()
// v1 := model.Mesh.vertexSkinnedPositions[tri.VertexIndices[1]]
// v2 := model.Mesh.vertexSkinnedPositions[tri.VertexIndices[2]]
// triCenter = Vector(vector.In(v0).Add(v1).Add(v2).Scale(1.0 / 3.0))
// } else {
// triCenter = tri.Center
// }
// dist := fastVectorDistanceSquared(point.workingPosition, triCenter)
// if dist > (point.distanceSquared + (tri.MaxSpan * tri.MaxSpan)) {
// return
// }
}else {
if1/distance*float32(p.energy)<0.001 {
return
}
}
// If you're on the other side of the plane, just assume it's not visible.
// if dot(model.Mesh.Triangles[triIndex].Normal, fastVectorSub(triCenter, point.cameraPosition).Unit()) < 0 {
// return light
// }
lightVec:=p.workingPosition.Sub(vertPos).Unit()
ifmat:=meshPart.Material;mat!=nil&&mat.LightingMode==LightingModeFixedNormals {
vertNormal=lightVec
}
diffuse:=vertNormal.Dot(lightVec)
ifmat:=meshPart.Material;mat!=nil&&mat.LightingMode==LightingModeDoubleSided {
diffuse=math32.Abs(diffuse)
}
ifdiffuse>0 {
diffuseFactor:=diffuse* (1.0/ (1.0+ (0.1*distance)))*2
ifp.Range>0 {
distClamp:=math32.Clamp((p.rangeSquared-distance)/distance,0,1)
diffuseFactor*=distClamp
}
targetColors[index].R+=p.color.R*float32(diffuseFactor)*p.energy
targetColors[index].G+=p.color.G*float32(diffuseFactor)*p.energy
targetColors[index].B+=p.color.B*float32(diffuseFactor)*p.energy
}
},onlyVisible)
}
func (p*PointLight)IsOn()bool {
returnp.On&&p.energy>0
}
func (p*PointLight)SetOn(onbool) {
p.On=on
}
func (p*PointLight)Color()Color {
returnp.color
}
func (p*PointLight)SetColor(colorColor) {
p.color=color
}
func (p*PointLight)Energy()float32 {
returnp.energy
}
func (p*PointLight)SetEnergy(energyfloat32) {
p.energy=energy
}
// Type returns the NodeType for this object.
func (p*PointLight)Type()NodeType {
returnNodeTypePointLight
}
//---------------//
// DirectionalLight represents a directional light of infinite distance.
typeDirectionalLightstruct {
*Node
colorColor// Color is the color of the light.
// energy is the overall energy of the light. Internally, technically there's no difference between a brighter color and a
// higher energy, but this is here for convenience / adherance to GLTF / 3D modelers.
energyfloat32
Onbool// If the light is on and contributing to the scene.
workingForwardVector3// Internal forward vector so we don't have to calculate it for every triangle for every model using this light.
workingModelRotationMatrix4// Similarly, this is an internal rotational transform (without the transformation row) for the Model being lit.
}
// NewDirectionalLight creates a new Directional Light with the specified RGB color and energy (assuming 1.0 energy is standard / "100%" lighting).
funcNewDirectionalLight(namestring,r,g,b,energyfloat32)*DirectionalLight {
sun:=&DirectionalLight{
Node:NewNode(name),
color:NewColor(r,g,b,1),
energy:energy,
On:true,
}
sun.owner=sun
returnsun
}
// Clone returns a new DirectionalLight clone from the given DirectionalLight.
func (sun*DirectionalLight)Clone()INode {
clone:=NewDirectionalLight(sun.name,sun.color.R,sun.color.G,sun.color.B,sun.energy)
clone.On=sun.On
clone.Node=sun.Node.clone(clone).(*Node)
ifrunCallbacks&&clone.Callbacks().OnClone!=nil {
clone.Callbacks().OnClone(clone)
}
returnclone
}
func (sun*DirectionalLight)beginRender() {
sun.workingForward=sun.WorldRotation().Forward()// Already reversed
}
func (sun*DirectionalLight)beginModel(model*Model) {
if!model.skinned {
sun.workingModelRotation=model.WorldRotation().Inverted().Transposed()
}
}
// Light returns the R, G, and B values for the DirectionalLight for each vertex of the provided Triangle.
func (sun*DirectionalLight)Light(meshPart*MeshPart,model*Model,targetColorsVertexColorChannel,onlyVisiblebool) {
meshPart.ForEachVertexIndex(func(indexint) {
varnormalVector3
ifmodel.skinned {
// If it's skinned, we don't have to calculate the normal, as that's been pre-calc'd for us
normal=model.Mesh.vertexSkinnedNormals[index]
}else {
normal=sun.workingModelRotation.MultVec(model.Mesh.VertexNormals[index])
}
ifmat:=meshPart.Material;mat!=nil&&mat.LightingMode==LightingModeFixedNormals {
normal=sun.workingForward
}
diffuseFactor:=normal.Dot(sun.workingForward)
ifmat:=meshPart.Material;mat!=nil&&mat.LightingMode==LightingModeDoubleSided {
diffuseFactor=math32.Abs(diffuseFactor)
}
ifdiffuseFactor<=0 {
return
}
targetColors[index].R+=sun.color.R*float32(diffuseFactor)*sun.energy
targetColors[index].G+=sun.color.G*float32(diffuseFactor)*sun.energy
targetColors[index].B+=sun.color.B*float32(diffuseFactor)*sun.energy
},onlyVisible)
}
func (sun*DirectionalLight)IsOn()bool {
returnsun.On&&sun.energy>0
}
func (sun*DirectionalLight)SetOn(onbool) {
sun.On=on
}
func (d*DirectionalLight)Color()Color {
returnd.color
}
func (d*DirectionalLight)SetColor(colorColor) {
d.color=color
}
func (d*DirectionalLight)Energy()float32 {
returnd.energy
}
func (d*DirectionalLight)SetEnergy(energyfloat32) {
d.energy=energy
}
// Type returns the NodeType for this object.
func (sun*DirectionalLight)Type()NodeType {
returnNodeTypeDirectionalLight
}
// CubeLight represents an AABB volume that lights triangles.
typeCubeLightstruct {
*Node
DimensionsDimensions// The overall dimensions of the CubeLight.
energyfloat32// The overall energy of the CubeLight
colorColor// The color of the CubeLight
Onbool// If the CubeLight is on or not
// A value between 0 and 1 indicating how much opposite faces are still lit within the volume (i.e. at LightBleed = 0.0,
// faces away from the light are dark; at 1.0, faces away from the light are fully illuminated)
Bleedfloat32
LightingAngleVector3// The direction in which light is shining. Defaults to local Y down (0, -1, 0).
workingDimensionsDimensions
workingPositionVector3
workingAngleVector3
}
// NewCubeLight creates a new CubeLight with the given dimensions.
funcNewCubeLight(namestring,dimensionsDimensions)*CubeLight {
cube:=&CubeLight{
Node:NewNode(name),
// Dimensions: Dimensions{{-w / 2, -h / 2, -d / 2}, {w / 2, h / 2, d / 2}},
Dimensions:dimensions,
energy:1,
color:NewColor(1,1,1,1),
On:true,
LightingAngle:Vector3{0,-1,0},
}
cube.owner=cube
returncube
}
// NewCubeLightFromModel creates a new CubeLight from the Model's dimensions and world transform.
// Note that this does not add it to the Model's hierarchy in any way - the newly created CubeLight
// is still its own Node.
funcNewCubeLightFromModel(namestring,model*Model)*CubeLight {
cube:=NewCubeLight(name,model.Mesh.Dimensions)
cube.SetWorldTransform(model.Transform())
cube.LightingAngle=model.WorldRotation().Up().Invert()
returncube
}
// Clone clones the CubeLight, returning a deep copy.
func (cube*CubeLight)Clone()INode {
newCube:=NewCubeLight(cube.name,cube.Dimensions)
newCube.energy=cube.energy
newCube.color=cube.color
newCube.On=cube.On
newCube.Bleed=cube.Bleed
newCube.LightingAngle=cube.LightingAngle
newCube.SetWorldTransform(cube.Transform())
newCube.Node=cube.Node.clone(newCube).(*Node)
ifrunCallbacks&&newCube.Callbacks().OnClone!=nil {
newCube.Callbacks().OnClone(newCube)
}
returnnewCube
}
// TransformedDimensions returns the AABB volume dimensions of the CubeLight as they have been scaled, rotated, and positioned to follow the
// CubeLight's node.
func (cube*CubeLight)TransformedDimensions()Dimensions {
p,s,r:=cube.Transform().Decompose()
corners:= [][]float32{
{1,1,1},
{1,-1,1},
{-1,1,1},
{-1,-1,1},
{1,1,-1},
{1,-1,-1},
{-1,1,-1},
{-1,-1,-1},
}
dimensions:=NewEmptyDimensions()
for_,c:=rangecorners {
position:=r.MultVec(Vector3{
(cube.Dimensions.Width()*c[0]*s.X/2),
(cube.Dimensions.Height()*c[1]*s.Y/2),
(cube.Dimensions.Depth()*c[2]*s.Z/2),
})
ifdimensions.Min.X>position.X {
dimensions.Min.X=position.X
}
ifdimensions.Min.Y>position.Y {
dimensions.Min.Y=position.Y
}
ifdimensions.Min.Z>position.Z {
dimensions.Min.Z=position.Z
}
ifdimensions.Max.X<position.X {
dimensions.Max.X=position.X
}
ifdimensions.Max.Y<position.Y {
dimensions.Max.Y=position.Y
}
ifdimensions.Max.Z<position.Z {
dimensions.Max.Z=position.Z
}
}
dimensions.Min=dimensions.Min.Add(p)
dimensions.Max=dimensions.Max.Add(p)
returndimensions
}
func (cube*CubeLight)beginRender() {
cube.workingAngle=cube.WorldRotation().MultVec(cube.LightingAngle.Invert())
}
func (cube*CubeLight)beginModel(model*Model) {
p,s,r:=model.Transform().Inverted().Decompose()
_,_,_=p,s,r
// Rather than transforming all vertices of all triangles of a mesh, we can just transform the
// point light's position by the inversion of the model's transform to get the same effect and save processing time.
// The same technique is used for Sphere - Triangle collision in bounds.go.
lightStartPos:=cube.WorldPosition().Add(cube.LightingAngle.Invert().Scale(cube.Dimensions.Height()/2))
cube.workingDimensions=cube.TransformedDimensions()
ifmodel.skinned {
cube.workingPosition=lightStartPos
}else {
sDen:=Vector3{1/s.X,1/s.Y,1/s.Z}
cube.workingPosition=r.MultVec(lightStartPos).Add(p.Mult(sDen))
// point.workingPosition = r.MultVec(point.WorldPosition()).Add(p.Mult(Vector{1 / s.X, 1 / s.Y, 1 / s.Z, s.W}))
cube.workingDimensions.Min=r.MultVec(cube.workingDimensions.Min.Mult(s))
cube.workingDimensions.Max=r.MultVec(cube.workingDimensions.Max.Mult(s))
cube.workingDimensions.Min=cube.workingDimensions.Min.Add(p)
cube.workingDimensions.Max=cube.workingDimensions.Max.Add(p)
}
}
// Light returns the R, G, and B values for the PointLight for all vertices of a given Triangle.
func (cube*CubeLight)Light(meshPart*MeshPart,model*Model,targetColorsVertexColorChannel,onlyVisiblebool) {
meshPart.ForEachVertexIndex(func(indexint) {
// TODO: Make lighting faster by returning early if the triangle is too far from the point light position
// We calculate both the eye vector as well as the light vector so that if the camera passes behind the
// lit face and backface culling is off, the triangle can still be lit or unlit from the other side. Otherwise,
// if the triangle were lit by a light, it would appear lit regardless of the positioning of the camera.
// var triCenter Vector
// if model.skinned {
// v0 := model.Mesh.vertexSkinnedPositions[triIndex*3].Clone()
// v1 := model.Mesh.vertexSkinnedPositions[triIndex*3+1]
// v2 := model.Mesh.vertexSkinnedPositions[triIndex*3+2]
// vector.In(v0).Add(v1).Add(v2).Scale(1.0 / 3.0)
// triCenter = v0
// } else {
// triCenter = model.Mesh.Triangles[triIndex].Center
// }
// dist := fastVectorDistanceSquared(cube.workingPosition, triCenter)
// if cube.Distance > 0 && dist > distanceSquared {
// return light
// }
// If you're on the other side of the plane, just assume it's not visible.
// if dot(model.Mesh.Triangles[triIndex].Normal, fastVectorSub(triCenter, point.cameraPosition).Unit()) < 0 {
// return light
// }
varvertPos,vertNormalVector3
ifmodel.skinned {
vertPos=model.Mesh.vertexSkinnedPositions[index]
vertNormal=model.Mesh.vertexSkinnedNormals[index]
}else {
vertPos=model.Mesh.VertexPositions[index]
vertNormal=model.Mesh.VertexNormals[index]
}
vardiffuse,diffuseFactorfloat32
ifmat:=meshPart.Material;mat!=nil&&mat.LightingMode==LightingModeFixedNormals {
vertNormal=cube.workingAngle
}
diffuse=vertNormal.Dot(cube.workingAngle)
ifmat:=meshPart.Material;mat!=nil&&mat.LightingMode==LightingModeDoubleSided {
diffuse=math32.Abs(diffuse)
}
ifcube.Bleed>0 {
ifdiffuse<0 {
diffuse=0
}
// diffuse += cube.Bleed
diffuse=cube.Bleed+ ((1-cube.Bleed)*diffuse)
ifdiffuse>1 {
diffuse=1
}
}
ifdiffuse<0 {
return
}else {
if!cube.workingDimensions.Inside(vertPos) {
diffuseFactor=0
}else {
diffuseFactor=diffuse
}
}
ifdiffuseFactor<=0 {
return
}
targetColors[index].R+=cube.color.R*float32(diffuseFactor)*cube.energy
targetColors[index].G+=cube.color.G*float32(diffuseFactor)*cube.energy
targetColors[index].B+=cube.color.B*float32(diffuseFactor)*cube.energy
},onlyVisible)
}
// IsOn returns if the CubeLight is on or not.
func (cube*CubeLight)IsOn()bool {
returncube.On
}
// SetOn sets the CubeLight to be on or off.
func (cube*CubeLight)SetOn(onbool) {
cube.On=on
}
func (cube*CubeLight)Color()Color {
returncube.color
}
func (cube*CubeLight)SetColor(colorColor) {
cube.color=color
}
func (cube*CubeLight)Energy()float32 {
returncube.energy
}
func (cube*CubeLight)SetEnergy(energyfloat32) {
cube.energy=energy
}
/////
// Type returns the type of INode this is (NodeTypeCubeLight).
func (cube*CubeLight)Type()NodeType {
returnNodeTypeCubeLight
}
// type polygonLightCell struct {
// Color *Color
// Distance float32
// }
// type PolygonLight struct {
// *Node
// Distance float32
// Energy float32
// Model *Model
// On bool
// gridSize float32
// lightCells [][][]*polygonLightCell
// }
// func NewPolygonLight(model *Model, energy float32, gridSize float32) *PolygonLight {
// poly := &PolygonLight{
// Model: model,
// Distance: 10,
// Energy: energy,
// On: true,
// lightCells: [][][]*polygonLightCell{},
// }
// poly.Node = model.Node
// poly.ResizeGrid(gridSize)
// return poly
// }
// func (poly *PolygonLight) ResizeGrid(gridSize float32) {
// poly.lightCells = [][][]*polygonLightCell{}
// dim := poly.Model.Mesh.Dimensions
// transform := poly.Model.Transform()
// zd := int(Ceil(dim.Depth() / gridSize))
// yd := int(Ceil(dim.Height() / gridSize))
// xd := int(Ceil(dim.Width() / gridSize))
// poly.lightCells = make([][][]*polygonLightCell, zd)
// for z := 0; z < zd; z++ {
// poly.lightCells[z] = make([][]*polygonLightCell, yd)
// for y := 0; y < yd; y++ {
// poly.lightCells[z][y] = make([]*polygonLightCell, xd)
// for x := 0; x < xd; x++ {
// gridPos := Vector{
// (float32(x) - float32(xd/2)) * gridSize,
// (float32(y) - float32(yd/2)) * gridSize,
// (float32(z) - float32(zd/2)) * gridSize,
// }
// gridPos = transform.MultVec(gridPos)
// // closest := poly.Model.Mesh.Triangles[0]
// closestDistance := Maxfloat32
// for _, tri := range poly.Model.Mesh.Triangles {
// tc := transform.MultVec(tri.Center)
// dist := fastVectorDistanceSquared(tc, gridPos)
// if dist < closestDistance {
// // closest = tri
// closestDistance = dist
// }
// }
// poly.lightCells[z][y][x] = &polygonLightCell{
// Color: NewColor(1, 1, 1, 1),
// Distance: closestDistance,
// }
// // if closestDistance <= gridSize*gridSize {
// // poly.lightPoints[z][y][x] = NewColor(1, 1, 1, 1)
// // } else {
// // poly.lightPoints[z][y][x] = nil
// // }
// }
// }
// }
// poly.gridSize = gridSize
// }
// func (poly *PolygonLight) Clone() INode {
// clone := NewPolygonLight(poly.Model.Clone().(*Model),
// poly.Energy,
// poly.gridSize,
// )
// clone.Node = clone.Model.Node
// clone.Distance = poly.Distance
// return clone
// }
// func (poly *PolygonLight) beginRender() {}
// func (poly *PolygonLight) beginModel(model *Model) {}
// func (poly *PolygonLight) Light(triIndex uint16, model *Model) [9]float32 {
// light := [9]float32{}
// var vertPos, vertNormal Vector
// color := poly.Model.Color
// // dist := tc.Sub(poly.centerPoints[0]).Magnitude()
// distanceSquared := poly.Distance * poly.Distance
// lightPos := Vector{0, 0, 0}
// for i := 0; i < 3; i++ {
// if model.skinned {
// vertPos = model.Mesh.vertexSkinnedPositions[triIndex*3+i]
// vertNormal = model.Mesh.vertexSkinnedNormals[triIndex*3+i]
// } else {
// vertPos = model.Mesh.VertexPositions[triIndex*3+i]
// vertNormal = model.Mesh.VertexNormals[triIndex*3+i]
// }
// lightVec := vector.In(fastVectorSub(lightPos, vertPos)).Unit()
// diffuse := dot(vertNormal, Vector(lightVec))
// if diffuse < 0 {
// diffuse = 0
// }
// var diffuseFactor float32
// distance := fastVectorDistanceSquared(lightPos, vertPos)
// diffuseFactor = diffuse * Max(Min(1.0-(Pow((distance/distanceSquared), 4)), 1), 0)
// light[i] = color.R * float32(diffuseFactor) * poly.Energy
// light[i+1] = color.G * float32(diffuseFactor) * poly.Energy
// light[i+2] = color.B * float32(diffuseFactor) * poly.Energy
// }
// return light
// }
// func (poly *PolygonLight) IsOn() bool {
// return poly.On && poly.Energy > 0
// }
// func (poly *PolygonLight) SetOn(on bool) {
// poly.On = on
// }
// // Type returns the NodeType for this object.
// func (poly *PolygonLight) Type() NodeType {
// return NodeTypePolygonLight
// }
// func (poly *PolygonLight) ToString() string {
// str := ""
// for z := range poly.lightCells {
// for y := range poly.lightCells[z] {
// for _, cell := range poly.lightCells[z][y] {
// if cell.Distance < 2 {
// str += "x"
// } else {
// str += " "
// }
// }
// }
// str += "\n"
// }
// return str
// }