picking

i am trying to pick objects in a scene where i use an orthographic camera. my code fragment already works, but it is not precise. i already found some answers on stackoverflow, but those are deprecated or won't work anymore at all. here is my code onMouseDown function onDocumentMouseUp( event ) { event.preventDefault(); mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1; mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1; var vector = new THREE.Vector3(mouse.x, mouse.y, 0.5); var pos = camera.position; var ray = new THREE.Raycaster(pos, vector.unproject(camera).sub(camera.position

As seen in the image I draw set of contours (polygons) as GL_LINE_STRIP. Now I want to select curve(polygon) under the mouse to delete,move..etc in 3D . I am wondering which method to use: 1.use OpenGL picking and selection. ( glRenderMode(GL_SELECT) ) 2.use manual collision detection , by using a pick-ray and check whether the ray is inside each polygon. I strongly recommend against GL_SELECT . This method is very old and absent in new GL versions, and you're likely to get problems with modern graphics cards. Don't expect it to be supported by hardware - probably you'd encounter a software

I want to do picking via IdMapping in Three.js Because of performance issues I only have one huge geometry, computed like this: for (var i = 0; i < numberOfVertices; i += 9) { p1 = new THREE.Vector3(graphData.triangles.vertices[i+0], graphData.triangles.vertices[i+1], graphData.triangles.vertices[i+2]); p2 = new THREE.Vector3(graphData.triangles.vertices[i+3], graphData.triangles.vertices[i+4], graphData.triangles.vertices[i+5]); p3 = new THREE.Vector3(graphData.triangles.vertices[i+6], graphData.triangles.vertices[i+7], graphData.triangles.vertices[i+8]); geometry.vertices.push(new THREE

What is the best method to select objects that have been drawn in OpenGL ES 2.0 (iOS)? I am drawing points. Here is working prototype of color picking, tested on most old ipads and working well. This is actually some part of project called InCube Chess that one may find in app store. The main code you will see is located in a class derived from GLKViewController like this: @interface IncubeViewController : GLKViewController This means you have glkview in it: ((GLKView *)self.view). Here are also some properties: @property (strong, nonatomic) EAGLContext *context; @property (strong, nonatomic)

I have a renderer using directx and openGL, and a 3d scene. The viewport and the window are of the same dimensions. How do I implement picking given mouse coordinates x and y in a platform independent way? Andreas Brinck If you can, do the picking on the CPU by calculating a ray from the eye through the mouse pointer and intersect it with your models. If this isn't an option I would go with some type of ID rendering. Assign each object you want to pick a unique color, render the objects with these colors and finally read out the color from the framebuffer under the mouse pointer. EDIT: If the