[orx-mesh, orx-mesh-generator, orx-obj-loader] Add decal and tangent tools

2024-09-25 09:51:46 +02:00
parent fb3bb6f7a6
commit e016891b1d
28 changed files with 1072 additions and 82 deletions
--- a/orx-mesh-generators/src/commonMain/kotlin/normals/MeshDataNormals.kt
+++ b/orx-mesh-generators/src/commonMain/kotlin/normals/MeshDataNormals.kt
@@ -0,0 +1,63 @@
+package org.openrndr.extra.meshgenerators.normals
+
+import org.openrndr.extra.mesh.IMeshData
+import org.openrndr.extra.mesh.IndexedPolygon
+import org.openrndr.extra.mesh.MeshData
+import org.openrndr.extra.mesh.VertexData
+import org.openrndr.math.Vector3
+
+/**
+ * Estimate per-vertex normals
+ */
+fun IMeshData.estimateNormals(): MeshData {
+    val normals = MutableList(vertexData.positions.size) { Vector3.ZERO }
+
+    for (polygon in polygons) {
+        for (p in polygon.positions) {
+            normals[p] += polygon.normal(vertexData)
+        }
+    }
+
+    for (i in normals.indices) {
+        normals[i] = normals[i].normalized
+    }
+
+    return MeshData(
+        VertexData(
+            vertexData.positions,
+            vertexData.textureCoords,
+            vertexData.colors,
+            normals,
+            vertexData.tangents,
+            vertexData.bitangents
+        ),
+        polygons.map {
+            IndexedPolygon(it.positions, it.textureCoords, it.colors, it.positions, it.tangents, it.bitangents)
+        })
+}
+
+/**
+ * Assign vertex normals based on face normals
+ */
+fun IMeshData.assignFaceNormals(): MeshData {
+    val normals = MutableList(polygons.size) { Vector3.ZERO }
+
+    for (i in polygons.indices) {
+        normals[i] = polygons[i].normal(vertexData)
+    }
+
+    return MeshData(
+        VertexData(
+            vertexData.positions,
+            vertexData.textureCoords,
+            vertexData.colors,
+            normals,
+            vertexData.tangents,
+            vertexData.bitangents
+        ),
+        polygons.mapIndexed { index, it ->
+            IndexedPolygon(it.positions, it.textureCoords, it.colors, it.positions.map {
+                index
+            }, it.tangents, it.bitangents)
+        })
+}