From 7d5766852dd4e4baed09b85a1ed3ad72ef3b8922 Mon Sep 17 00:00:00 2001 From: Abe Pazos Date: Sun, 16 Jun 2024 18:07:46 +0200 Subject: [PATCH] [orx-obj-loader] Add OBJSaver.kt, demos --- demo-data/obj-models/suzanne/Suzanne.mtl | 2 + demo-data/obj-models/suzanne/Suzanne.obj | 2066 +++++++++++++++++ orx-obj-loader/README.md | 16 + orx-obj-loader/build.gradle.kts | 3 +- .../src/demo/kotlin/DemoObjLoader01.kt | 31 + .../src/demo/kotlin/DemoObjSaver01.kt | 22 + .../src/demo/kotlin/DemoObjSaver02.kt | 35 + orx-obj-loader/src/main/kotlin/OBJLoader.kt | 90 +- orx-obj-loader/src/main/kotlin/OBJSaver.kt | 94 + 9 files changed, 2325 insertions(+), 34 deletions(-) create mode 100644 demo-data/obj-models/suzanne/Suzanne.mtl create mode 100644 demo-data/obj-models/suzanne/Suzanne.obj create mode 100644 orx-obj-loader/src/demo/kotlin/DemoObjLoader01.kt create mode 100644 orx-obj-loader/src/demo/kotlin/DemoObjSaver01.kt create mode 100644 orx-obj-loader/src/demo/kotlin/DemoObjSaver02.kt create mode 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+16,19 @@ drawer.vertexBuffer(vertexBuffer, DrawPrimitive.TRIANGLES) ``` + +## Demos +### DemoObjLoader01 +[source code](src/demo/kotlin/DemoObjLoader01.kt) + +![DemoObjLoader01Kt](https://raw.githubusercontent.com/openrndr/orx/media/orx-obj-loader/images/DemoObjLoader01Kt.png) + +### DemoObjSaver01 +[source code](src/demo/kotlin/DemoObjSaver01.kt) + +![DemoObjSaver01Kt](https://raw.githubusercontent.com/openrndr/orx/media/orx-obj-loader/images/DemoObjSaver01Kt.png) + +### DemoObjSaver02 +[source code](src/demo/kotlin/DemoObjSaver02.kt) + +![DemoObjSaver02Kt](https://raw.githubusercontent.com/openrndr/orx/media/orx-obj-loader/images/DemoObjSaver02Kt.png) diff --git a/orx-obj-loader/build.gradle.kts b/orx-obj-loader/build.gradle.kts index 84b5623fc..6729d57b4 100644 --- a/orx-obj-loader/build.gradle.kts +++ b/orx-obj-loader/build.gradle.kts @@ -5,4 +5,5 @@ plugins { dependencies { implementation(libs.openrndr.application) implementation(libs.openrndr.math) -} \ No newline at end of file + demoImplementation(project(":orx-mesh-generators")) +} diff --git a/orx-obj-loader/src/demo/kotlin/DemoObjLoader01.kt b/orx-obj-loader/src/demo/kotlin/DemoObjLoader01.kt new file mode 100644 index 000000000..470f52459 --- /dev/null +++ b/orx-obj-loader/src/demo/kotlin/DemoObjLoader01.kt @@ -0,0 +1,31 @@ +import org.openrndr.application +import org.openrndr.color.ColorRGBa +import org.openrndr.draw.DepthTestPass +import org.openrndr.draw.DrawPrimitive +import org.openrndr.draw.shadeStyle +import org.openrndr.extra.objloader.loadOBJasVertexBuffer +import org.openrndr.math.Vector3 + +fun main() = application { + program { + val mesh = loadOBJasVertexBuffer("demo-data/obj-models/suzanne/Suzanne.obj") + + extend { + drawer.perspective(60.0, width * 1.0 / height, 0.01, 1000.0) + drawer.depthWrite = true + drawer.depthTestPass = DepthTestPass.LESS_OR_EQUAL + drawer.fill = ColorRGBa.PINK + drawer.shadeStyle = shadeStyle { + fragmentTransform = """ + vec3 lightDir = normalize(vec3(0.3, 1.0, 0.5)); + float l = dot(va_normal, lightDir) * 0.4 + 0.5; + x_fill.rgb *= l; + """.trimIndent() + } + drawer.translate(0.0, 0.0, -2.0) + drawer.rotate(Vector3.UNIT_X, -seconds * 2 + 30) + drawer.rotate(Vector3.UNIT_Y, -seconds * 15 + 20) + drawer.vertexBuffer(mesh, DrawPrimitive.TRIANGLES) + } + } +} \ No newline at end of file diff --git a/orx-obj-loader/src/demo/kotlin/DemoObjSaver01.kt b/orx-obj-loader/src/demo/kotlin/DemoObjSaver01.kt new file mode 100644 index 000000000..68bef7b1a --- /dev/null +++ b/orx-obj-loader/src/demo/kotlin/DemoObjSaver01.kt @@ -0,0 +1,22 @@ +import org.openrndr.application +import org.openrndr.draw.loadFont +import org.openrndr.extra.objloader.loadOBJasVertexBuffer +import org.openrndr.extra.objloader.saveOBJ + +fun main() = application { + configure { + height = 100 + } + program { + val path = "demo-data/obj-models" + val mesh = loadOBJasVertexBuffer("$path/suzanne/Suzanne.obj") + mesh.saveOBJ("$path/Suzanne-exported.obj") + + val font = loadFont("demo-data/fonts/IBMPlexMono-Regular.ttf", 24.0) + + extend { + drawer.fontMap = font + drawer.text(".obj file loaded and saved", 10.0, 80.0) + } + } +} \ No newline at end of file diff --git a/orx-obj-loader/src/demo/kotlin/DemoObjSaver02.kt b/orx-obj-loader/src/demo/kotlin/DemoObjSaver02.kt new file mode 100644 index 000000000..6277e4c5f --- /dev/null +++ b/orx-obj-loader/src/demo/kotlin/DemoObjSaver02.kt @@ -0,0 +1,35 @@ +import org.openrndr.application +import org.openrndr.draw.loadFont +import org.openrndr.extra.meshgenerators.buildTriangleMesh +import org.openrndr.extra.meshgenerators.sphere +import org.openrndr.extra.objloader.saveOBJ + +fun main() = application { + configure { + height = 100 + } + program { + val path = "demo-data/obj-models/" + val mesh = buildTriangleMesh { + repeat(4) { x -> + repeat(4) { y -> + repeat(4) { z -> + isolated { + translate(x * 1.0, y * 1.0, z * 1.0) + sphere(8, 8, + (x * 91 + y * 79 + z * 17).mod(5) * 0.2 + 0.1) + } + } + } + } + } + mesh.saveOBJ("$path/sphere-composition-exported.obj") + + val font = loadFont("demo-data/fonts/IBMPlexMono-Regular.ttf", 24.0) + + extend { + drawer.fontMap = font + drawer.text("Mesh generated and .obj file saved", 10.0, 80.0) + } + } +} \ No newline at end of file diff --git a/orx-obj-loader/src/main/kotlin/OBJLoader.kt b/orx-obj-loader/src/main/kotlin/OBJLoader.kt index 5ab03b068..088a05de5 100644 --- a/orx-obj-loader/src/main/kotlin/OBJLoader.kt +++ b/orx-obj-loader/src/main/kotlin/OBJLoader.kt @@ -8,13 +8,24 @@ import org.openrndr.math.Vector2 import org.openrndr.math.Vector3 import java.io.File import java.net.MalformedURLException +import java.net.URI import java.net.URL import kotlin.math.max import kotlin.math.min -class Triangle(val positions: Array = emptyArray(), - val normals: Array = emptyArray(), - val textureCoords: Array = emptyArray()) { +/** + * A 3D Triangle + * + * @property positions Three vertex positions + * @property normals Three vertex normals + * @property textureCoords There texture coordinates + * @constructor Create empty Triangle + */ +class Triangle( + val positions: Array = emptyArray(), + val normals: Array = emptyArray(), + val textureCoords: Array = emptyArray() +) { fun transform(t: Matrix44): Triangle { return Triangle(positions.map { (t * it.xyz1).div }.toTypedArray(), normals, textureCoords) } @@ -22,6 +33,9 @@ class Triangle(val positions: Array = emptyArray(), class Box(val corner: Vector3, val width: Double, val height: Double, val depth: Double) +/** + * Calculates the bounding box of a list of [Triangle]. + */ fun bounds(triangles: List): Box { var minX = Double.POSITIVE_INFINITY var minY = Double.POSITIVE_INFINITY @@ -45,6 +59,17 @@ fun bounds(triangles: List): Box { return Box(Vector3(minX, minY, minZ), maxX - minX, maxY - minY, maxZ - minZ) } +/** + * The vertexFormat of a mesh including positions, normals and texture coordinates. + */ +private val objVertexFormat = vertexFormat { + position(3) + normal(3) + textureCoordinate(2) +} +/** + * Converts a list of [Triangle] into a [VertexBuffer] + */ fun List.vertexBuffer(): VertexBuffer { val vertexBuffer = vertexBuffer(objVertexFormat, size * 3) vertexBuffer.put { @@ -52,7 +77,7 @@ fun List.vertexBuffer(): VertexBuffer { for (i in it.positions.indices) { write(it.positions[i]) write(it.normals[i]) - write(Vector2.ZERO) + write(it.textureCoords[i]) } } } @@ -60,6 +85,12 @@ fun List.vertexBuffer(): VertexBuffer { return vertexBuffer } +/** + * Loads an OBJ file + * + * @param fileOrUrl + * @return + */ fun loadOBJ(fileOrUrl: String): Map> { return try { val url = URL(fileOrUrl) @@ -69,12 +100,6 @@ fun loadOBJ(fileOrUrl: String): Map> { } } -private val objVertexFormat = vertexFormat { - position(3) - normal(3) - textureCoordinate(2) -} - fun loadOBJasVertexBuffer(fileOrUrl: String): VertexBuffer { return try { val url = URL(fileOrUrl) @@ -88,23 +113,23 @@ fun loadOBJasVertexBuffer(url: URL): VertexBuffer = loadOBJasVertexBuffer(url.re fun loadOBJasVertexBuffer(file: File): VertexBuffer = loadOBJasVertexBuffer(file.readLines()) fun loadOBJasVertexBuffer(lines: List): VertexBuffer { val objects = loadOBJ(lines) - val triangleCount = objects.values.sumBy { it.size } + val triangleCount = objects.values.sumOf { it.size } val vertexBuffer = vertexBuffer(objVertexFormat, triangleCount * 3) vertexBuffer.put { objects.entries.forEach { - it.value.forEach { - for (i in it.positions.indices) { - write(it.positions[i]) - if (it.normals.isNotEmpty()) { - write(it.normals[i]) + it.value.forEach { tri -> + for (i in tri.positions.indices) { + write(tri.positions[i]) + if (tri.normals.isNotEmpty()) { + write(tri.normals[i]) } else { - val d0 = it.positions[2] - it.positions[0] - val d1 = it.positions[1] - it.positions[0] + val d0 = tri.positions[2] - tri.positions[0] + val d1 = tri.positions[1] - tri.positions[0] write(d0.normalized.cross(d1.normalized).normalized) } - if (it.textureCoords.isNotEmpty()) { - write(it.textureCoords[i]) + if (tri.textureCoords.isNotEmpty()) { + write(tri.textureCoords[i]) } else { write(Vector2.ZERO) } @@ -139,15 +164,14 @@ fun loadOBJEx(lines: List): Pair>> { if (tokens.isNotEmpty()) { when (tokens[0]) { - "v" -> { - positions += Vector3(tokens[1].toDouble(), tokens[2].toDouble(), tokens[3].toDouble()) - } + "v" -> positions += Vector3(tokens[1].toDouble(), tokens[2].toDouble(), tokens[3].toDouble()) "vn" -> normals += Vector3(tokens[1].toDouble(), tokens[2].toDouble(), tokens[3].toDouble()) "vt" -> textureCoords += Vector2(tokens[1].toDouble(), tokens[2].toDouble()) "g" -> { activeMesh = mutableListOf() meshes[tokens.getOrNull(1) ?: "no-name-${meshes.size}"] = activeMesh } + "f" -> { val indices = tokens.subList(1, tokens.size).map { it.split("/") }.map { it.map { it.toIntOrNull() } @@ -160,24 +184,24 @@ fun loadOBJEx(lines: List): Pair>> { val s = indices.size val ps = if (attributes >= 1) arrayOf( - indices[(0 + o) % s][0]?.let { positions[it - 1] } ?: Vector3.ZERO, - indices[(1 + o) % s][0]?.let { positions[it - 1] } ?: Vector3.ZERO, - indices[(2 + o) % s][0]?.let { positions[it - 1] } ?: Vector3.ZERO) + indices[(0 + o) % s][0]?.let { positions[it - 1] } ?: Vector3.ZERO, + indices[(1 + o) % s][0]?.let { positions[it - 1] } ?: Vector3.ZERO, + indices[(2 + o) % s][0]?.let { positions[it - 1] } ?: Vector3.ZERO) else emptyArray() val tcs = if (attributes >= 2) arrayOf( - indices[(0 + o) % s][1]?.let { textureCoords[it - 1] } ?: Vector2.ZERO, - indices[(1 + o) % s][1]?.let { textureCoords[it - 1] } ?: Vector2.ZERO, - indices[(2 + o) % s][1]?.let { textureCoords[it - 1] } ?: Vector2.ZERO) + indices[(0 + o) % s][1]?.let { textureCoords[it - 1] } ?: Vector2.ZERO, + indices[(1 + o) % s][1]?.let { textureCoords[it - 1] } ?: Vector2.ZERO, + indices[(2 + o) % s][1]?.let { textureCoords[it - 1] } ?: Vector2.ZERO) else emptyArray() val ns = if (attributes >= 3) arrayOf( - indices[(0 + o) % s][2]?.let { normals[it - 1] } ?: Vector3.ZERO, - indices[(1 + o) % s][2]?.let { normals[it - 1] } ?: Vector3.ZERO, - indices[(2 + o) % s][2]?.let { normals[it - 1] } ?: Vector3.ZERO) + indices[(0 + o) % s][2]?.let { normals[it - 1] } ?: Vector3.ZERO, + indices[(1 + o) % s][2]?.let { normals[it - 1] } ?: Vector3.ZERO, + indices[(2 + o) % s][2]?.let { normals[it - 1] } ?: Vector3.ZERO) else emptyArray() @@ -192,4 +216,4 @@ fun loadOBJEx(lines: List): Pair>> { } } return Pair(OBJData(positions, normals, textureCoords), meshes) -} \ No newline at end of file +} diff --git a/orx-obj-loader/src/main/kotlin/OBJSaver.kt b/orx-obj-loader/src/main/kotlin/OBJSaver.kt new file mode 100644 index 000000000..276e789b3 --- /dev/null +++ b/orx-obj-loader/src/main/kotlin/OBJSaver.kt @@ -0,0 +1,94 @@ +package org.openrndr.extra.objloader + +import org.openrndr.draw.VertexBuffer +import java.io.File +import java.nio.ByteBuffer +import java.nio.ByteOrder + +/** + * An Ordered Map. + * Container of Vec2 / Vec3 String representations. + * Ensures no strings are duplicates (using a Map) + * and order (using a List). + */ +private class UniqueCoords { + // Map pointing unique strings to their index. + // We could just use `coords.indexOf(floats)` but using a map is faster. + private val indices = mutableMapOf() + + // List containing unique Strings + private val coords = mutableListOf() + + /** + * Adds strings only if they are not found yet in `coords`. + * Returns the index of the received argument inside `coords`. + */ + fun add(floats: String): Int { + val index = indices[floats] + return if (index == null) { + coords.add(floats) + val newIndex = coords.size + indices[floats] = newIndex + newIndex + } else index + } + + /** + * Returns a valid .obj block representing `coords`. + */ + fun toObjBlock(token: String) = coords.joinToString("\n$token ", "$token ", "\n") +} + +/** + * Saves a VertexBuffer to a Wavefront OBJ file. + * Faces use indices. Vertices, normals and texture coordinates are deduplicated. + */ +fun VertexBuffer.saveOBJ(filePath: String) { + val bb = ByteBuffer.allocateDirect(vertexCount * vertexFormat.size) + bb.order(ByteOrder.nativeOrder()) + read(bb) + + val tokens = mapOf( + "position" to "v", + "normal" to "vn", + "texCoord0" to "vt" + ) + + val indexMap = tokens.values.associateWith { UniqueCoords() } + val lastIndices = tokens.values.associateWith { 0 }.toMutableMap() + val vertexIndices = mutableListOf() + + // Process the ByteBuffer and populate data structures + while (bb.position() < bb.capacity()) { + vertexFormat.items.forEach { vertexElement -> + val floats = List(vertexElement.type.componentCount) { + bb.getFloat() + }.joinToString(" ") + val token = tokens[vertexElement.attribute] + if (token != null) { + lastIndices[token] = indexMap[token]!!.add(floats) + } + } + vertexIndices.add("${lastIndices["v"]}/${lastIndices["vt"]}/${lastIndices["vn"]}") + } + + val f = File(filePath) + f.bufferedWriter().use { writer -> + writer.run { + // Write header + appendLine("# OPENRNDR") + appendLine("# www.openrndr.org") + appendLine("o " + f.name) + + // Write v, vt, vn blocks + indexMap.forEach { (token, verts) -> + appendLine(verts.toObjBlock(token)) + + } + // Write faces processing three vertices at a time + vertexIndices.chunked(3) { + appendLine("f ${it[0]} ${it[1]} ${it[2]}") + } + } + } +} \ No newline at end of file