How can I keep my sprites facing the Mapbox gl camera?
To do this, I assume I need access to the Mapbox camera position - however, I don't know how to access this from inside the Three.js scene.
Any ideas?
Related
I am using THREE.MeshLine from https://github.com/spite/THREE.MeshLine to try and draw lines in three.js. The lines appear to work when using a perspective camera to view the scene as the demos showed, but when I use an orthographic camera which is the camera I need to use for my project, the line is distorted.
For now, I am trying to make sure that the line works by creating a sin wave, but with the ortho camera, it looks like this:
Why does the mesh not display correctly with an orthographic camera? Are there any ways to fix this or achieve orthographic lines with a thickness in three.js?
This is a know issue, see https://github.com/spite/THREE.MeshLine/issues/118.
The wide line implementation of three.js does support orthographic cameras, though.
I have a scene with some 3d Objects when you drag the scene objects look stretched. See the image
I know that this is the normal behavior But I have a client with this weird requirement, that the objects should move but without the distortion on the shape.
Is there way to do that?
That’s due to the camets fov. You can change it through the camera component
I used sprites in Three js to display 2d images, the problem that I faced with sprites that they rotate to face the camera.
I am trying to use it to fake a shadow for the 3d object. When I rotate the camera the 3d object tilt with the camera until it makes a 30-degree angle with the horizontal but it's shadow (2d sprite) still at 0 degrees.
How to disable the auto rotation of sprite, or is there another solution to preview 2d images in three js to look like a 3d object?
How to disable the auto rotation of sprite, or is there another solution to preview 2d images in three js to look like a 3d object?
It's not possible to disable the orientation towards the camera with a flag or configuration. You would have to modify the shader code of SpriteMaterial for this.
I suggest you use a mesh instead based on a PlaneBufferGeometry and a MeshBasicMaterial. Alternatively, you write a custom billboard shader with ShaderMaterial or RawShaderMaterial.
I want to realize a 3D interactive globe with three.js and I wonder if there is a way to intersect over Sprites primitive with the Raycaster?
If you check the source code for RayCaster at
https://github.com/mrdoob/three.js/blob/master/src/core/Raycaster.js
it would appear that the intersectObject function only checks objects that are instances of THREE.Particle or THREE.Mesh, not THREE.Sprite. Possibly this is because sprites could be set to use screen coordinates, and so a ray that projects into your 3d scene wouldn't make sense in this situation, or if placed in the scene as the sprite image always faces the camera, it doesn't act like your standard 3d mesh.
Perhaps you could attach a PlaneGeometry or a very thin CubeGeometry to the position of your sprite, set its rotation to the rotation of the camera so that it is always parallel to the view plane of the camera like the sprite is, and then check for intersections with the mesh instead?
I've been struggling with an application where I'm trying to set the camera rotation initially so when the scene is loaded, you'll be looking where we want you to look.
The backstory, I'm creating a panorama viewer where the panorama is applied to a mesh with a sphere geometry.
The problem I'm having is I don't seem to be able to set the camera rotation. I've tried multiple attempts, but none have been working. I attempted setting the camera rotation after creating the camera, and I tried applying the target of my orbitcontrols and setting the object rotation in the orbit controls. I haven't had any luck yet with just setting an initial camera rotation.
I'm really hoping at this point that this is due to something minor that I'm over looking.
Here's a source: http://www.freeptools.com/mapster/testing-360s2.php
It shows the camera itself AND the orbit controls object. It also shows what their target is I'm setting, and what they really are. So far I haven't been able to get this to accept anything I give it.
THREE.js OrbitControls take over the camera completely, so you should not use that in conjunction with updating camera rotations.
Instead, OrbitControls has methods that help you do this: https://github.com/mrdoob/three.js/blob/master/examples/js/controls/OrbitControls.js
orbitControls.rotateLeft( angle );
orbitControls.rotateUp( angle );
In addition, you can move orbitControls.target around (it's a THREE.Vector3) and the camera will just look to that direction.