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Questions tagged [ray-picking]

56 questions
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How to select objects when using the Orthographic camera in Three Js

I've got an isometric level going and I'm trying to select objects within the level. I've looked at a few Stackoverflow answers including this one Orthographic camera and selecting objects with raycast but at the moment, nothing seems to be…
Rohan Deshpande
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How to convert mouse coordinates into world coordinates

What I want to do Picking an object. Requirements / Conditions My mouse is always in the center of the screen. Pick only the first / nearest object What I want to know How can I convert my mouse coordinates (actually 0,0 since the mouse is…
boop
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Where did I go wrong trying to implement picking with raycasting in OpenGL ES 2.0 for iOS?

I'm trying to implement picking with raycasting in OpenGL ES 2.0 for an iPad App. Specifically, I want to know which cell of a minecraft-like map made up of square cells with varying heights the user has tapped on. However, my code does not find an…
Ben Pious
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How to efficiently implement "point-on-heightmap" picking in OpenGL?

I want to track the mouse coordinates in my OpenGL scene on the ground surface of the world which is modeled as a height map. Currently there is no fancy stuff like hardware tessellation. Note that this question is not about object…
leemes
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OpenGL ES 2.0 Ray Picking, far point

Help me please with ray picking float aspect = fabsf(self.view.bounds.size.width / self.view.bounds.size.height); GLKMatrix4 projectionMatrix = GLKMatrix4MakePerspective(GLKMathDegreesToRadians(35.0f), aspect, 0.1f, 1000.0f); GLKMatrix4…
Volodymyr B.
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OpenGL: mouse move objects, object can't follow mouse

After picking an object with the mouse, I want to be able to move the object using the mouse. First, I translate mouse position to world position, and use glReadPixels() to read the depth of the object as z's: double xpos, ypos,…
yan
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Ray picking origin in front of the camera

I am trying to implement a ray picking algorithm. I want to get a ray that allow me to then check, which vertex is under my cursor. I've followed a few tutorial but i get a strange result. My origin is located in the center of the screen, the…
Tackwin
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Question about 3D Picking in Android (with OpenGL ES 2)

I need some help on 3D picking. I am using the way it works here. In short, what I have is: normalizedPoint[0] = (x * 2 / screenW) -1; normalizedPoint[1] = 1 - (y * 2 / screenH); normalizedPoint[2] = ? normalizedPoint[3] = ? for 2 and 3, I have no…
xandy
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GPU Picking inconsistent across devices

I’m trying to implement GPU picking with Points using code I modified from the latter half of this article https://threejsfundamentals.org/threejs/lessons/threejs-picking.html It’s been working fine for me on desktop, but I started testing different…
Deklan Webster
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opengl ray picking/tracing with cardboard (GVR)

For the demonstration, I made a small application that draws three squares of random size and random location. Drawing squares: private void renderObject(float[] modelViewProjection, FloatBuffer vertexCoordsBuf, int i) { …
Anton111111
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Ray picking in android - how to manage different shapes

I`m confused. I've read a lot of different tutorials related with ray picking. But every time those example are based on some simple shape, square or triangle. In each example for each shape there is a function that is checking this specific shape.…
Fixus
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How do I get the ray direction of where I click on the screen in world coordinates (DX11, C++)

I'm trying to convert the point of which I click on the screen to get a ray direction of where I'm clicking. Eventually this will be used for an intersection of some sort. The direction I have now seems to produce strange results and I'm not sure…
user
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Hit tests in SharpDX do not work after rotating a model

In the example I want to use to demonstrate my problem, I have a single model of a turbine and a small grid as shown in the images below. The bounding box of the model is displayed as a red box. I try to check which nodes in my green grid lie above…
GameDevAlien
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get 3d objects name by touching using min3d android

i need to add features of my android project, to get each name of the 3d objects. The objects are irregular and it can be rotate based on the user's gesture. I have lots of reading on openGL ray picking but still cant figure out how to make it work.…
sarabrown
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Intersection test for ray picking in opengl es for android

Ok so I was able to get the coordinates in 3d space for the touch now I need to test whether that ray intersected a triangle. What I am asking is for help to understand the Test Class. BTW this code came from…
Dakota Miller
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