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205 | import * as THREE from 'three/webgpu'
import {
Break,
cos,
float,
If,
Loop,
normalize,
sin,
time,
uniform,
vec2,
vec3,
Fn,
positionLocal,
reflect,
mix,
exp,
int,
abs,
ShaderNodeObject
} from 'three/tsl'
import { atmosphericScattering } from './AtmosphericScattering'
import Land from './Land'
import ShadowMarcher from './ShadowMarcher'
import AmbientOcclusion from './AmbientOcclusion'
import Fog from './Fog'
import GUI from 'three/examples/jsm/libs/lil-gui.module.min.js'
import Ocean from './Ocean'
import Fresnel from './Fresnel'
//import Clouds from './Clouds'
export default class SDFScene {
private static options = {
maxSteps: 384,
surfaceDistance: 0.005,
cameraNear: 0.01,
cameraFar: 192.0,
reflectivity: 0.5
}
private static maxSteps = uniform(this.options.maxSteps)
private static surfaceDistance = uniform(this.options.surfaceDistance)
private static cameraNear = uniform(this.options.cameraNear)
private static cameraFar = uniform(this.options.cameraFar)
private static reflectivity = uniform(this.options.reflectivity)
private static scene = Fn(([position]: [ShaderNodeObject<THREE.Node>]) => {
const land = Land.scene(position)
const ocean = Ocean.scene(position)
//const clouds = Clouds.scene(position)
const distance = vec2(land, 0).toVar()
If(distance.x.greaterThan(ocean), () => {
distance.assign(vec2(ocean, 1))
})
// If(distance.x.greaterThan(clouds), () => {
// distance.assign(vec2(clouds, 2))
// })
return distance
})
private static getNormal = Fn(
([position, distance]: [ShaderNodeObject<THREE.Node>, ShaderNodeObject<THREE.Node>]) => {
const offset = vec2(0.0001, 0)
return normalize(
distance.sub(
vec3(
this.scene(position.sub(offset.xyy)).x,
this.scene(position.sub(offset.yxy)).x,
this.scene(position.sub(offset.yyx)).x
)
)
)
}
)
static render = Fn(([rayOrigin_immutable]: [ShaderNodeObject<THREE.Node>]) => {
const rayOrigin = rayOrigin_immutable.toVar()
const p = positionLocal
const rayDirection = normalize(p).toVar()
const t = time.div(5)
//const lightPosition = vec3(0, 50, this.cameraFar.negate())
//const lightPosition = vec3(0, sin(t).mul(30).add(43), this.cameraFar.negate())
const lightPosition = vec3(sin(t).mul(this.cameraFar), 50, cos(t).mul(this.cameraFar))
//const lightPosition = vec3(sin(t).mul(this.cameraFar), sin(t).mul(40).add(50), cos(t).mul(this.cameraFar))
const lightDirection = normalize(lightPosition.sub(p)).toVar()
const skyColour = atmosphericScattering(vec3(p.x, abs(p.y), p.z), normalize(lightPosition)).toVar()
const finalColour = skyColour.toVar()
const reflectivityFactor = float(1.0).toVar()
const accumulatedDistance = float(this.cameraNear).toVar()
const fogDistance = accumulatedDistance.toVar()
const maxReflections = int(1).toVar()
Loop({ start: 0, end: maxReflections, condition: '<=' }, () => {
accumulatedDistance.assign(0)
const distance = vec2(0).toVar()
const position = vec3(0).toVar()
Loop({ start: 0, end: this.maxSteps }, () => {
position.assign(rayOrigin.add(rayDirection.mul(accumulatedDistance)))
distance.assign(this.scene(position))
If(abs(distance.x).lessThan(this.surfaceDistance).or(accumulatedDistance.greaterThan(this.cameraFar)), () => {
Break()
})
accumulatedDistance.addAssign(distance.x)
fogDistance.addAssign(distance.x)
})
const normal = this.getNormal(position, distance.x).toVar()
If(accumulatedDistance.lessThan(this.cameraFar), () => {
If(distance.y.equal(0), () => {
// land
finalColour.assign(
mix(
finalColour,
Land.render(position, normal, rayDirection, lightPosition, lightDirection, this.scene),
reflectivityFactor
)
)
maxReflections.assign(0) //do not calc reflections on land layer
}).Else(() => {
//}).ElseIf(distance.y.equal(1), () => {
// ocean
normal.assign(mix(vec3(0, 1, 0), normal, exp(accumulatedDistance.pow(3).mul(-0.005))))
finalColour.assign(
Ocean.render(finalColour, position, normal, rayDirection, lightPosition, lightDirection, this.scene)
)
rayOrigin.assign(position.add(normal.mul(this.surfaceDistance)))
rayDirection.assign(reflect(rayDirection, normal))
reflectivityFactor.assign(this.reflectivity)
})
// .Else(() => {
// // clouds
// finalColour.assign(mix(finalColour, Clouds.render(finalColour, normal, lightDirection), reflectivityFactor))
// maxReflections.assign(0) //do not calc reflections on cloud layer
// })
// fog
finalColour.assign(Fog.render(skyColour, finalColour, fogDistance))
})
})
return finalColour
})
static setGUI(gui: GUI) {
const folder = gui.addFolder('SDF Scene')
folder
.add(this.options, 'maxSteps', 1, 512, 1)
.name('Raymarch Max Steps')
.onChange((v) => {
this.maxSteps.value = v
})
folder
.add(this.options, 'surfaceDistance', 0, 0.01, 0.0001)
.name('Surface Distance')
.onChange((v) => {
this.surfaceDistance.value = v
})
folder
.add(this.options, 'cameraNear', 0.0001, 10, 0.1)
.name('Camera Near')
.onChange((v) => {
this.cameraNear.value = v
})
folder
.add(this.options, 'cameraFar', 1, 512, 0.1)
.name('Camera Far')
.onChange((v) => {
this.cameraFar.value = v
})
folder
.add(this.options, 'reflectivity', 0, 1, 0.01)
.name('Reflectivity')
.onChange((v) => {
this.reflectivity.value = v
})
folder.close()
ShadowMarcher.setGUI(gui)
AmbientOcclusion.setGUI(gui)
Land.setGUI(gui)
Ocean.setGUI(gui)
Fresnel.setGUI(gui)
//Clouds.setGUI(gui)
Fog.setGUI(gui)
}
}
|
