Camera Postion Problem In VR

🌵 Needle Engine
1

Hi want to stop the movement of my camera in VR because i’m creating a blend of 3d objects combining with skybox in my scene because of this it feels like the positions of my 3d objects are changing when i mov my head in VR.

2

Hi Abdul Raheem! To achieve a stationary camera in VR while blending 3D objects with a skybox, you can lock the camera’s position, so it doesn’t move with head tracking. Here’s a step-by-step plan in pseudocode:

  1. Create a VR camera in your scene.
  2. Set the camera’s position to a fixed value.
  3. Disable the default camera movement or head tracking for this camera.
  4. Ensure your 3D objects are positioned relative to the camera’s fixed position.

Here’s an example code snippet in Needle Engine:

import { Camera, VRButton } from "@needle-tools/engine";

class FixedCameraController {
    constructor(scene) {
        this.camera = new Camera();
        this.scene = scene;

        // Set the fixed position for the camera
        this.camera.position.set(0, 1.6, 3); // Example position (adjust as necessary)

        // Load the VR environment
        this.initWebXR();
    }

    initWebXR() {
        document.body.appendChild(VRButton.createButton(this.renderer));
        this.renderer.xr.enabled = true;

        // Disable the default movement
        this.camera.xr = false;

        // Update camera without head movement
        this.renderer.setAnimationLoop(() => {
            this.update();
        });
    }

    update() {
        // Only update your scene without changing the camera's position
        this.scene.update();
    }
}

// Usage
const scene = new Scene();
const fixedCameraController = new FixedCameraController(scene);

In this script:

  • The camera’s position is fixed at (0, 1.6, 3) which you can adjust to fit your scene.
  • The default camera movement is disabled by using this.camera.xr = false;.

You might want to adapt this code depending on your project specifics. If you have further integration questions or need additional help, please share more details about your project setup!

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3

Hey, “freezing” the camera in VR is not recommended since it causes people nausea. If you want to reduce the parallax effect, you can scale the content of your scene up (e.g. by factor 100) so the positional head motion has less of an effect. You probably also want to update the near/far clip planes of your camera if you do that.

4

@Felix_Herbst what i’m working with is that i only have a 3d object and a 3d canvas and everything other than that is an hdri and i’m merging the 3d object with the skybox in normal circumstances it works fine but when we view it in VR and stand or sit while wearing VR headset the position of the 3d object changes as well. I’m also sending you a link you can test it youself. Thank you.

5

@Felix_Herbst i don’t want to freeze the camera i only want it to stop its position but not the rotation

6

I understand. Have you tried my suggestion of scaling the XRRig down (or the scene up) for VR use? That will have exactly the effect you’re describing.

7

Sorry for not understanding your point and thanks alot this has resolved my issue. But i’m facing another issue of UI and mesh flickering in VR i think it is from my end

8

OK, good to hear the first one is now resolved. If you run into something else, please open a new topic – thanks!

9

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