Massively optimise .obj loading

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>sh.ball</groupId>
     <artifactId>osci-render</artifactId>
-    <version>1.17.2</version>
+    <version>1.17.3</version>
 
     <name>osci-render</name>
 

src/main/java/sh/ball/engine/Camera.java

@@ -21,6 +21,7 @@ public class Camera {
   private static final double VERTEX_VALUE_THRESHOLD = 1;
   private static final double CAMERA_MOVE_INCREMENT = -0.1;
   private static final int SAMPLE_RENDER_SAMPLES = 50;
+  private static final int VERTEX_SAMPLES = 1000;
 
   private double focalLength;
   private Vector3 pos;
@@ -35,17 +36,7 @@ public class Camera {
   }
 
   public List<Shape> draw(WorldObject worldObject) {
-    return getFrame(getProjectedVertices(worldObject), worldObject.getVertexPath());
-  }
-
-  public Map<Vector3, Vector2> getProjectedVertices(WorldObject worldObject) {
-    Map<Vector3, Vector2> projectionMap = new HashMap<>();
-
-    for (Vector3 vertex : worldObject.getVertices()) {
-      projectionMap.put(vertex, project(vertex));
-    }
-
-    return projectionMap;
+    return getFrame(worldObject.getVertexPath());
   }
 
   // Automatically finds the correct Z position to use to view the world object properly.
@@ -70,7 +61,9 @@ public class Camera {
     List<Vector2> vertices = new ArrayList<>();
 
     for (int i = 0; i < SAMPLE_RENDER_SAMPLES - 1; i++) {
-      vertices.addAll(getProjectedVertices(clone).values());
+      for (int j = 0; j < Math.min(VERTEX_SAMPLES, clone.numVertices()); j++) {
+        vertices.add(project(clone.getVertex(j)));
+      }
       clone.rotate(rotation);
     }
 
@@ -106,13 +99,13 @@ public class Camera {
     );
   }
 
-  public List<Shape> getFrame(Map<Vector3, Vector2> projectionMap, List<Vector3> vertexPath) {
+  public List<Shape> getFrame(List<Vector3> vertexPath) {
     List<Shape> lines = new ArrayList<>();
 
     for (int i = 0; i < vertexPath.size(); i += 2) {
       lines.add(new Line(
-        projectionMap.get(vertexPath.get(i)),
-        projectionMap.get(vertexPath.get(i + 1))
+        project(vertexPath.get(i)),
+        project(vertexPath.get(i + 1))
       ));
     }
 

src/main/java/sh/ball/engine/Vector3.java

@@ -35,53 +35,61 @@ public final class Vector3 {
 
   public Vector3 add(Vector3 other) {
     return new Vector3(
-      getX() + other.getX(),
-      getY() + other.getY(),
-      getZ() + other.getZ()
+      x + other.x,
+      y + other.y,
+      z + other.z
     );
   }
 
   public Vector3 scale(double factor) {
     return new Vector3(
-      getX() * factor,
-      getY() * factor,
-      getZ() * factor
+      x * factor,
+      y * factor,
+      z * factor
     );
   }
 
   public Vector3 rotate(Vector3 rotation) {
-    return rotateX(rotation.getX())
-      .rotateY(rotation.getY())
-      .rotateZ(rotation.getZ());
+    return rotateX(rotation.x)
+      .rotateY(rotation.y)
+      .rotateZ(rotation.z);
   }
 
   public Vector3 rotateX(double theta) {
+    double cos = Math.cos(theta);
+    double sin = Math.sin(theta);
     return new Vector3(
-      getX(),
-      Math.cos(theta) * getY() - Math.sin(theta) * getZ(),
-      Math.sin(theta) * getY() + Math.cos(theta) * getZ()
+      x,
+      cos * y - sin * z,
+      sin * y + cos * z
     );
   }
 
   public Vector3 rotateY(double theta) {
+    double cos = Math.cos(theta);
+    double sin = Math.sin(theta);
     return new Vector3(
-      Math.cos(theta) * getX() + Math.sin(theta) * getZ(),
-      getY(),
-      -Math.sin(theta) * getX() + Math.cos(theta) * getZ()
+      cos * x + sin * z,
+      y,
+      -sin * x + cos * z
     );
   }
 
   public Vector3 rotateZ(double theta) {
+    double cos = Math.cos(theta);
+    double sin = Math.sin(theta);
     return new Vector3(
-      Math.cos(theta) * getX() - Math.sin(theta) * getY(),
-      Math.sin(theta) * getX() + Math.cos(theta) * getY(),
-      getZ()
+      cos * x - sin * y,
+      sin * x + cos * y,
+      z
     );
   }
 
-  // TODO: Is this correctly used?!
   public double distance(Vector3 vector) {
-    return Math.sqrt(Math.pow(vector.x, 2) + Math.pow(vector.y, 2) + Math.pow(vector.z, 2));
+    double xDiff = x - vector.x;
+    double yDiff = y - vector.y;
+    double zDiff = z - vector.z;
+    return Math.sqrt(xDiff * xDiff + yDiff * yDiff + zDiff * zDiff);
   }
 
   public static Vector3 meanPoint(List<Vector3> points) {

src/main/java/sh/ball/engine/WorldObject.java

@@ -76,6 +76,7 @@ public class WorldObject {
 
     // Chinese Postman can only be performed on connected graphs, so iterate over all connected
     // sub-graphs.
+    // TODO: parallelize?
     for (Set<Vector3> vertices : inspector.connectedSets()) {
       AsSubgraph<Vector3, DefaultWeightedEdge> subgraph = new AsSubgraph<>(graph, vertices);
       ChinesePostman<Vector3, DefaultWeightedEdge> cp = new ChinesePostman<>();
@@ -108,14 +109,12 @@ public class WorldObject {
     position = new Vector3();
   }
 
-  public List<Vector3> getVertices() {
-    List<Vector3> newVertices = new ArrayList<>();
+  public Vector3 getVertex(int i) {
+    return objVertices.get(i).rotate(rotation).add(position);
+  }
 
-    for (Vector3 vertex : objVertices) {
-      newVertices.add(vertex.rotate(rotation).add(position));
-    }
-
-    return newVertices;
+  public int numVertices() {
+    return objVertices.size();
   }
 
   private Set<Line3D> loadFromInput(InputStream input) {