terrain height maps using noise, meshes with child meshes
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@ -27,17 +27,17 @@
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{
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"name": "Circle"
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,"transformation": [
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1
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1.29986
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,0
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,0
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,0
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,0
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,1
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,1.29986
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,0
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,0
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,0
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,0
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,1
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,1.29986
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,0
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,0
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,0
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@ -43,29 +43,48 @@ class HeightMap {
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}
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class SimplexHeightMap extends HeightMap {
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constructor (offsetX, offsetY, size, seed) {
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// amplitude - Controls the amount the height changes. The higher, the taller the hills.
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// persistence - Controls details, value in [0,1]. Higher increases grain, lower increases smoothness.
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// octaves - Number of noise layers
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// period - Distance above which we start to see similarities. The higher, the longer "hills" will be on a terrain.
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// lacunarity - Controls period change across octaves. 2 is usually a good value to address all detail levels.
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constructor (offsetX, offsetY, size, seed, amplitude = 15, persistence = 0.4, octaves = 5, period = 80, lacunarity = 2) {
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super(size)
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this.ix = offsetX
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this.iy = offsetY
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this.seed = seed
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this.osn = new OpenSimplexNoise(seed)
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this.amplitude = amplitude
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this.period = period
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this.lacunarity = lacunarity
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this.octaves = octaves
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this.persistence = persistence
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}
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getNoise (relX, relY) {
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let x = ((this.ix * this.size) + relX) / this.size - 0.5
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let y = ((this.iy * this.size) + relY) / this.size - 0.5
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getNoise (zx, zy) {
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let x = ((this.size * this.ix) + zx) / this.period
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let y = ((this.size * this.iy) + zy) / this.period
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let total = this.osn.noise2D(2 * x, 2 * y) +
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0.5 * this.osn.noise2D(4 * x, 4 * y) +
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0.25 * this.osn.noise2D(2 * x, 2 * y)
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let amp = 1.0
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let max = 1.0
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let sum = this.osn.noise2D(x, y)
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total *= 10
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return total
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let i = 0
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while (++i < this.octaves) {
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x *= this.lacunarity
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y *= this.lacunarity
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amp *= this.persistence
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max += amp
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sum += this.osn.noise2D(x, y) * amp
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}
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return sum / max
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}
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getHeight (x, y) {
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return this.getNoise(x, y)
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return this.getNoise(x, y) * this.amplitude
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}
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}
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@ -1,13 +1,53 @@
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import Resource from '../resource'
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import { Texture, Material } from './material'
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import { mat4 } from 'gl-matrix'
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import { mat4, quat, vec3 } from 'gl-matrix'
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let meshCache = {}
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/**
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* Returns an euler angle representation of a quaternion
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* @param {vec3} out Euler angles, pitch-yaw-roll
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* @param {quat} mat Quaternion
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* @return {vec3} out
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*/
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quat.getEuler = function (out, quat) {
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let x = quat[0]
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let y = quat[1]
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let z = quat[2]
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let w = quat[3]
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let x2 = x * x
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let y2 = y * y
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let z2 = z * z
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let w2 = w * w
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let unit = x2 + y2 + z2 + w2
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let test = x * w - y * z
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if (test > 0.499995 * unit) {
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// singularity at the north pole
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out[0] = Math.PI / 2
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out[1] = 2 * Math.atan2(y, x)
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out[2] = 0
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} else if (test < -0.499995 * unit) {
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// singularity at the south pole
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out[0] = -Math.PI / 2
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out[1] = 2 * Math.atan2(y, x)
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out[2] = 0
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} else {
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out[0] = Math.asin(2 * (x * z - w * y))
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out[1] = Math.atan2(2 * (x * w + y * z), 1 - 2 * (z2 + w2))
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out[2] = Math.atan2(2 * (x * y + z * w), 1 - 2 * (y2 + z2))
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}
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return out
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}
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class Node {
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constructor (pos, scale, rotation) {
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// Translation
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this.pos = pos || [0.0, 0.0, 0.0]
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// Scaling
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this.scale = scale || [1.0, 1.0, 1.0]
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// Rotation in Euler angles (yaw, pitch, roll) in radians
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this.rotation = rotation || [0.0, 0.0, 0.0]
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this.transform = mat4.create()
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@ -55,12 +95,35 @@ class Node {
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}
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}
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setTransformation (transform) {
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let quaternion = quat.create()
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let translation = vec3.create()
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let rotation = vec3.create()
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let scale = vec3.create()
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mat4.getTranslation(translation, transform)
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mat4.getScaling(scale, transform)
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mat4.getRotation(quaternion, transform)
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quat.getEuler(rotation, quaternion)
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this.rotation = rotation
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this.pos = translation
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this.scale = scale
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this.updateTransform()
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}
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// Setters
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setPosition (newPos) {
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this.pos = newPos
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this.updateTransform()
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}
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setTranslation (newTrans) {
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this.setPosition(newTrans)
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}
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setScale (newScale) {
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this.scale = newScale
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this.updateTransform()
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@ -99,6 +162,10 @@ class Node {
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return this.pos
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}
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get translation () {
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return this.pos
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}
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// Draw base
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draw (gl, shader) {
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// Set model transform matrix uniform
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@ -132,7 +199,7 @@ class Mesh extends Node {
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gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(indices), gl.STATIC_DRAW)
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let mesh = new Mesh()
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mesh.pos = pos
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mesh.posBuffer = pos
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mesh.ebo = ebo
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mesh.indices = indices.length
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@ -219,7 +286,8 @@ class Mesh extends Node {
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})
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}
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let finished = []
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// Load everything
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let loadComplete = []
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for (let i in cleaned) {
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let meshdata = cleaned[i]
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let mesh = Mesh.construct(gl, meshdata.vertices, meshdata.indices,
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@ -235,7 +303,37 @@ class Mesh extends Node {
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}
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}
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finished.push(mesh)
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loadComplete.push(mesh)
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}
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// Now, we need to give the meshes the appropriate parents and transforms.
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let finished = []
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function setChildren (parent, chMeshes) {
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let meshIndex = chMeshes.meshes[0]
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let mesh = loadComplete[meshIndex]
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if (chMeshes.children) {
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for (let i in chMeshes.children) {
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if (!chMeshes.children[i].meshes) continue
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setChildren(mesh, chMeshes.children[i])
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}
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}
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mesh.name = chMeshes.name
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if (parent == null) {
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finished.push(mesh)
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} else {
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parent.children.push(mesh)
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mesh.parent = parent
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mesh.setTransformation(chMeshes.transformation)
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}
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}
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let rootchildren = dat.rootnode.children
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for (let j in rootchildren) {
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if (!rootchildren[j].meshes) continue
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setChildren(null, rootchildren[j])
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}
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// Cache the mesh
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@ -245,7 +343,7 @@ class Mesh extends Node {
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}
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bindBuffers (gl, shader) {
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gl.bindBuffer(gl.ARRAY_BUFFER, this.pos)
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gl.bindBuffer(gl.ARRAY_BUFFER, this.posBuffer)
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shader.setAttribute(gl, 'aVertexPosition', 3, false, 3 * Float32Array.BYTES_PER_ELEMENT, 0)
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if (this.nms && shader.hasAttribute(gl, 'aNormal')) {
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12
src/index.js
12
src/index.js
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import Engine from './engine'
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import Camera from './engine/camera'
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// import Entity from './engine/mesh/entity'
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import Entity from './engine/mesh/entity'
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import { Environment } from './engine/environment'
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import { Terrain } from './engine/components/terrain'
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@ -11,10 +11,12 @@ let game = new Engine()
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let env = new Environment()
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async function pipeline () {
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// let entity = await Entity.createEntity(game.gl, 'test', [0.0, 0.0, -6.0])
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// let shader = await game.shaders.createShaderFromFiles(game.gl, 'basic', false)
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let entity = await Entity.createEntity(game.gl, 'test', [0.0, 0.0, -6.0])
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let shader = await game.shaders.createShaderFromFiles(game.gl, 'basic', false)
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let terrainShader = await game.shaders.createShaderFromFiles(game.gl, 'terrain', false)
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console.log(entity.mesh)
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// Create a height map based on OpenSimplex noise
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let hmap = new SimplexHeightMap(1, 1, 256, 50)
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@ -53,6 +55,10 @@ async function pipeline () {
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// Render function for the triangle
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game.addRenderFunction(function (gl) {
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shader.use(gl)
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cam.draw(gl, shader)
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entity.draw(gl, shader)
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// Use terrain shader
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terrainShader.use(gl)
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