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import {
BufferAttribute,
BufferGeometry,
Float32BufferAttribute,
Material,
Matrix4,
Mesh,
MeshBasicMaterial,
ShaderMaterial,
Vector3
} from "three"
import { getXMLrelationships, getXMLcontentType } from "./generateXML/build3mfStatics"
import { getXMLmodelConfig } from "./generateXML/build3mfModelConfig"
import { getXMLmodel } from "./generateXML/build3mfModel"
export interface Volume {
id: number
name: string
color: string
extruder: number
firstTriangleId: number
lastTriangleId: number
}
export async function serialize3mf(mesh: Mesh): Promise<string> {
const { vertices, triangles, volumes } = extractMeshData(mesh)
const model = getXMLmodel(vertices, triangles)
const modelConfig = getXMLmodelConfig(volumes)
const contentType = getXMLcontentType()
const relationships = getXMLrelationships()
const data = {
"3D": {
"3dmodel.model": strToU8(model)
},
_rels: {
".rels": strToU8(relationships)
},
Metadata: {
"Slic3r_PE_model.config": strToU8(modelConfig)
},
"[Content_Types].xml": strToU8(contentType)
}
const options = {
comment: "created by CodeCharta"
}
const compressed3mf = zipSync(data, options).buffer
return compressed3mf as unknown as string
}
function extractMeshData(mesh: Mesh): {
vertices: string[]
triangles: string[]
volumes: Volume[]
} {
const vertices: string[] = []
const triangles: string[] = []
const volumes: Volume[] = []
const vertexToNewVertexIndex: Map<string, number> = new Map()
const colorToExtruder: Map<string, number> = new Map()
const volumeCount = 1
for (const child of mesh.children as Mesh[]) {
extractChildMeshData(child, vertices, triangles, vertexToNewVertexIndex, volumeCount, colorToExtruder, volumes)
}
return { vertices, triangles, volumes }
}
function extractChildMeshData(
mesh: Mesh,
vertices: string[],
triangles: string[],
vertexToNewVertexIndex: Map<string, number>,
volumeCount: number,
colorToExtruder: Map<string, number>,
volumes: Volume[],
parentMatrix: Matrix4 = undefined
): void {
if (!mesh.visible) {
return
}
for (const child of mesh.children as Mesh[]) {
let newParentMatrix = mesh.matrix
if (parentMatrix) {
newParentMatrix = parentMatrix.clone().multiply(mesh.matrix)
}
extractChildMeshData(child, vertices, triangles, vertexToNewVertexIndex, volumeCount, colorToExtruder, volumes, newParentMatrix)
}
const colorToVertexIndices = groupMeshVerticesByColor(mesh)
const vertexIndexToNewVertexIndex: Map<number, number> = new Map()
for (const [color, vertexIndexes] of colorToVertexIndices.entries()) {
const firstTriangleId = triangles.length
constructVertices(vertices, vertexToNewVertexIndex, vertexIndexToNewVertexIndex, vertexIndexes, mesh, parentMatrix)
constructTriangles(mesh.geometry, triangles, vertexIndexToNewVertexIndex, vertexIndexes)
constructVolume(mesh, color, firstTriangleId, triangles.length - 1, volumes, volumeCount, colorToExtruder)
volumeCount++
}
}
function groupMeshVerticesByColor(mesh: Mesh): Map<string, number[]> {
const colorToVertexIndices: Map<string, number[]> = new Map()
if (mesh.geometry.attributes.color) {
for (let index = 0; index < mesh.geometry.attributes.color.count; index++) {
const hexColorString = convertColorArrayToHexString(mesh.geometry.attributes.color as Float32BufferAttribute, index)
if (colorToVertexIndices.has(hexColorString)) {
colorToVertexIndices.get(hexColorString).push(index)
} else {
colorToVertexIndices.set(hexColorString, [index])
}
}
} else if (mesh.geometry.attributes.position) {
const material = mesh.material as Material
let hexColorString: string
if ((material as MeshBasicMaterial).color) {
hexColorString = (material as MeshBasicMaterial).color.getHexString()
} else if ((material as ShaderMaterial).isShaderMaterial) {
const colorArray = (material as ShaderMaterial).defaultAttributeValues.color
hexColorString = convertColorArrayToHexString(colorArray, 0)
}
const indexArray = Array.from({ length: mesh.geometry.attributes.position.count }, (_, index) => index)
colorToVertexIndices.set(hexColorString, indexArray)
}
return colorToVertexIndices
}
function constructVertices(
vertices: string[],
vertexToNewVertexIndex: Map<string, number>,
vertexIndexToNewVertexIndex: Map<number, number>,
vertexIndexes: number[],
mesh: Mesh,
parentMatrix: Matrix4
) {
const positionAttribute = mesh.geometry.attributes.position
for (const vertexIndex of vertexIndexes) {
const vertex = new Vector3(
positionAttribute.getX(vertexIndex),
positionAttribute.getY(vertexIndex),
positionAttribute.getZ(vertexIndex)
)
vertex.applyMatrix4(mesh.matrix)
if (parentMatrix) {
vertex.applyMatrix4(parentMatrix)
}
const vertexString = `<vertex x="${vertex.x}" y="${vertex.y}" z="${vertex.z}"/>`
if (!vertexToNewVertexIndex.has(vertexString)) {
vertices.push(vertexString)
vertexToNewVertexIndex.set(vertexString, vertices.length - 1)
vertexIndexToNewVertexIndex.set(vertexIndex, vertices.length - 1)
} else {
vertexIndexToNewVertexIndex.set(vertexIndex, vertexToNewVertexIndex.get(vertexString))
}
}
return
}
function constructTriangles(
geometry: BufferGeometry,
triangles: string[],
vertexIndexToNewVertexIndex: Map<number, number>,
vertexIndexes: number[]
): void {
if (!geometry.index) {
for (let index = 0; index < vertexIndexToNewVertexIndex.size; index += 3) {
const triangle = `<triangle v1="${vertexIndexToNewVertexIndex.get(index)}" v2="${vertexIndexToNewVertexIndex.get(
index + 1
)}" v3="${vertexIndexToNewVertexIndex.get(index + 2)}" />`
triangles.push(triangle)
}
} else {
const vertexIndices = geometry.index
for (let index = 0; index < vertexIndices.count; index += 3) {
const vertexIndex1 = vertexIndices.getX(index)
const vertexIndex2 = vertexIndices.getY(index)
const vertexIndex3 = vertexIndices.getZ(index)
if (vertexIndexes.includes(vertexIndex1) && vertexIndexes.includes(vertexIndex2) && vertexIndexes.includes(vertexIndex3)) {
const triangle = `<triangle v1="${vertexIndexToNewVertexIndex.get(vertexIndex1)}" v2="${vertexIndexToNewVertexIndex.get(
vertexIndex2
)}" v3="${vertexIndexToNewVertexIndex.get(vertexIndex3)}" />`
triangles.push(triangle)
}
}
}
}
function constructVolume(
child: Mesh,
color: string,
firstTriangleId: number,
lastTriangleId: number,
volumes: Volume[],
volumeCount: number,
colorToExtruder: Map<string, number>
): void {
if (!colorToExtruder.has(color)) {
colorToExtruder.set(color, colorToExtruder.size + 1)
}
const extruder = colorToExtruder.get(color)
const volumeName = child.name === "Map" ? `${child.name} 0x${color}` : child.name
const volume: Volume = {
id: volumeCount,
name: volumeName,
color,
extruder,
firstTriangleId,
lastTriangleId
}
volumes.push(volume)
}
function convertColorArrayToHexString(color: Float32BufferAttribute | number[], index: number): string {
const colorsArray: number[] =
color instanceof BufferAttribute
? [
(color as Float32BufferAttribute).getX(index),
(color as Float32BufferAttribute).getY(index),
(color as Float32BufferAttribute).getZ(index)
]
: [color[index], color[index + 1], color[index + 2]]
return colorsArray
.map(c =>
Math.round(c * 255)
.toString(16)
.padStart(2, "0")
)
.join("")
}
export const exportedForTesting = {
extractMeshData,
extractChildMeshData,
groupMeshVerticesByColor,
constructVertices,
constructTriangles,
constructVolume,
convertColorArrayToHexString
}
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