Questions tagged [matrix]
The matrix tag has no usage guidance.
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How to apply scale, translate, rotate with different origin and get new rectangle coordinates
I was reading other questions in this topic but I couldn't apply any viable solution to solve my use case.
I have a crop area described with two dimensions (cropWidth, cropHeight)
I can easly compute ...
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1answer
2k views
How do I build my tangent space matrix?
I'd like to understand how the process of building the "tangent space" matrix for normal mapping works. I'm following several tutorials, and other stackexchange questions, but I'm unfamiliar with the ...
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1answer
345 views
Final transformation matrix to transform world coordinate into vrc [duplicate]
For a 3D scene in the world coordinates, its View Reference Point $\mathrm{VRP}$ is at $(5,2,1)$, and a viewer is looking towards point $A=(1,1,1)$. Construct a transform matrix which will map world ...
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353 views
Tilting a 3d object to face a camera and have it look like it's spinning on the y axis
I have a scene kit app I'm working on and at a certain point I move the camera under a list of objects and tilt it up to give a star wars type view of them. I then need to pull the objects up one at a ...
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Perspective projection near plane not in world coordinates
I have a camera I have placed zunits away from a billboarded rect. My goal is to discard all other geometry that is closer to the camera/in front of this rect.
With ...
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1answer
221 views
Why do we call it TRS and MVP, instead of SRT and MVP or TRS and PVM?
Here's something that's been bothering me while learning graphics. We have two core concatenated matrix sets: "TRS" for transforms, and "MVP" for moving everything into the canonical view volume.
TRS ...
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3answers
424 views
Rotation of a random unit vector at a point in 3D space by an angle
I have a scenario where I need rotate a vector ( unit vector) at a point in space by an angle along Z-axis. Is it possible to help me to understand a procedure to achieve this. I'm using vb.net ...
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67 views
Model View Projection Matrix Multiplcation Order
I'm working on a simple software renderer and have a working implementation so far. I'm curious as to why it's actually working since I would expect the multiplication ordering for my world, view and ...
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37 views
Matrix transforming with translation/rotation/scale at center of screen
I'm trying to create a camera using matrix transforms, the gist as follows:
...
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1answer
32 views
THREEjs: updating an object's matrix doesnt change it's position and rotation params
I want to set a transformation matrix to an object upon creation and then control it by position, rotation and scale, but while changing the matrix does change the object in world space, it's position ...
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1answer
60 views
How to calculate position from depth pass of the ZED camera?
I'm using the ZED 2 camera, and although the API provides a means of getting a point cloud position from a specific pixel, for my project I need to be able to perform this calculation myself from the ...
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67 views
Crystal ball rotation - I don't get why the code works
For context:
I'm absolutely new to graphics programming and I've always had trouble getting the math.
I had the task to write code for a crystal ball interface using OpenGL.
There's an object in the ...
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49 views
Compose ViewMatrix and ProjectionMatrix
As the title says, you are able to compose the ViewMatrix and the ProjectionMatrix into one instead of multiplying a vector by the individual matrices.
Instead of doing this at run time for each item:
...
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25 views
How to calculate clip to device coordinates with matrix
I am trying to convert my points from Cartesian points (X,Y,Z) and run them through a clip to device pipeline. I do not know the specific matrix for this problem and was looking for some help. Thanks
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1answer
408 views
Translate an arcball camera upwards or left-right
This problem is giving me a really hard time.
I'm always looking at the origin and have a camera that moves around it in an arcball mode.
That part works beautifully:
I'm calculating the camera ...
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255 views
Octave matrix to image pixels too small (do not have 1 pixel per integer)
I am working on a project which plots points over a checkerboard (representing seats for people). I would like each pixel in the image to represent each integer matrix entry. After updating my ...
