Make 3D

1 files changed, 49 insertions, 0 deletions

diff --git a/lib/systems/camera_rotator.js b/lib/systems/camera_rotator.js
new file mode 100644
index 0000000..3520f71
--- /dev/null
+++ b/lib/systems/camera_rotator.js
@@ -0,0 +1,49 @@
+import { mat4, vec3 } from 'gl-matrix';
+import { System } from '@serpentity/serpentity';
+import Cameras from '../nodes/cameras';
+
+export default class CameraRotator extends System {
+
+  constructor() {
+
+    super();
+  }
+
+  added(engine){
+
+    this.cameras = engine.getNodes(Cameras);
+  }
+
+  removed(){
+
+    delete this.cameras;
+  }
+
+  update(dt){
+
+    for (const camera of this.cameras) {
+
+      let rotationMatrix = mat4.create();
+      mat4.rotateY(rotationMatrix, rotationMatrix, camera.angle.yaw);
+      mat4.rotateX(rotationMatrix, rotationMatrix, camera.angle.pitch);
+      mat4.rotateZ(rotationMatrix, rotationMatrix, camera.angle.roll);
+
+      let eye = vec3.fromValues(0, 0, camera.radius.radius);
+      vec3.transformMat4(eye, eye, rotationMatrix);
+
+      camera.position.x = eye[0];
+      camera.position.y = eye[1];
+      camera.position.z = eye[2];
+
+      let up = vec3.fromValues(0, 1, 0);
+      vec3.transformMat4(up, up, rotationMatrix);
+      camera.up.x = up[0];
+      camera.up.y = up[1];
+      camera.up.z = up[2];
+
+      camera.angle.pitch = (camera.angle.pitch + camera.velocity.x * dt / 100 + 2 * Math.PI) % (2 * Math.PI);
+      camera.angle.yaw = (camera.angle.yaw + camera.velocity.y * dt / 100 + 2 * Math.PI) % (2 * Math.PI);
+      camera.angle.roll = (camera.angle.roll + camera.velocity.z * dt / 100 + 2 * Math.PI) % (2 * Math.PI);
+    }
+  }
+};