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Questions tagged [projection-matrix]

234 questions
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Porting from OpenGL to MetalKit - Projection Matrix (?) Problems

Question I'm working on porting from OpenGL (OGL) to MetalKit (MTK) on iOS. I'm failing to get identical display in the MetalKit version of the app. I modified the projection matrix to account for differences in Normalized Device Coordinates between…
janoside
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Calculate camera matrix with KNOWN parameters (Python)?

OpenCV provides methods to calibrate a camera. I want to know if it also has a way to simply generate a view projection matrix if and when the parameters are known. i.e I know the camera position, rotation, up, FOV... and whatever else is needed,…
Makogan
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Convert Projection Matrix to Realworld Matrix

I'm using the following code to get the projection matrix from ARCore. Frame.CameraImage.GetCameraProjectionMatrix(m_Camera.nearClipPlane, m_Camera.farClipPlane); I would like to convert the Projection Matrix to World Matrix from the perspective of…
user6038900
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Why don't my shaders work for trapezoids polygons?

I need to draw parts of a texture on trapezoids polygons. (old school fake-3D race game, the road is made of these trapezoids and I want to apply a texture on them.) But the texture appears wrong, like if each of the two triangles forming a…
Diego
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Projection of 3D Lidar point in the i-th camera image (KITTI Dataset)

I am working on an object classification problem, and I am using Lidar and camera data from the Kitti Dataset. In this article: http://www.cvlibs.net/publications/Geiger2013IJRR.pdf, they provide the formulas for projecting the 3d PointCloud into…
Doxcos44
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Render- and Eyespace- misalignment causing imprecise raycasting

I have been working on a Minecraft-like voxel game for a while and decided to implements block placing and destroying via raycasting. I realized however, that when standing very close to a block, the block rotates around itself rather than the…
J. Lengel
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Building Virtual Camera in OpenGL with Given Intrinsics

I am trying to get simulated depth image of an object model in OpenGL given the intrinsics parameters of a RealSense camera, fx fy ppx ppy. I construct the projection matrix myself with the help from this, that and also that. Somehow the result is…
mjfoo21
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How to convert back points in 2d to 3d with known orthogonal (camera) projection matrix?

I have a numpy array with 2d points that I convert from 3d to 2d via the following equation: https://wikimedia.org/api/rest_v1/media/math/render/svg/198f15da062c7ce00598d7a2f9bd8169d7042ed3 How can I convert the point back to 3D? I used the top down…
Josue
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ArCore :: anchor - To appear in front of camera always using ArSession_acquireNewAnchor API

App-info: I am developing an Android application based on ArCore (NDK) to augment certain objects (generated from blender tool) over real camera feed. Now that I am able to draw objects as anchors which scales up/down upon camera position changes.…
ShreeVidhya
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Behaviour of perspective projection to convert 3D point to screen

I'm recoding the rendering pipeline in c++ and have some trouble to make it works. I mean, it's working but not in the way i expected. To make it simple, i transform my 3D point to 2D point with a perspective projection matrix builds as follow : My…
LenweSeregon
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lwjgl Model(not from Blender) rendering behind the camera from +Z to -Z

I am trying to rendering a model but it is projecting behind the camera, i am thinking of the problem being in the projection matrix from the link having the same problem LWJGL Projection Matrix - Nothing Happens. I modified the projection matrix…
ch.Joshi elijah
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How to move around in a terrain with respect to the viewing direction

I want to move around left/right, forward/backward in a terrain (delta x, delta y in m_mouseMovement) with respect to the current viewing direction. The following code works with zooming (mouse wheel). But movement works only as long as the viewing…
Hyndrix
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Understanding CSS3DRenderer in depth

i hope you're all doing great even though it's probably hot as hell outside! I am currently working with Three.js' CSS3DRenderer to combine both DOM elements and webGL content. I managed to do everything i wanted but now I'm kinda curious about how…
Jonathan
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Project visible pixels in one view onto another

In WebGL or in pure matrix math I would like to match the pixels in one view to another view. That is, imagine I take pixel with x,y = 0,0. This pixel lies on the surface of a 3d object in my world. I then orbit around the object slightly. Where…
Marcus
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libgdx - setProjectionMatrix

I am trying to render some sprites and I need the line batch.setProjectionMatrix(cam.combined); in order for the sprites to move independently from the camera, however when I add this line the sprites suddenly turn abnormally large, but without it…
Grual
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