Questions tagged [perspective]
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91 questions
1 vote
1 answer
58 views
Math questions for deriving the perspective FoV transform
I am digging into a tutorial atm, but already the first equation is stumping me, and i was looking to not only refine my understanding of it, but also to get some advice on a better DIY approach in ...
- 99
0 votes
0 answers
49 views
How to select multiple objects in a 3D scene with perspective?
I would like to select multiple object from a rectangle drawn with the mouse. But once unprojected, the rectangle become a trapeze. These objects are on an inclined plane facing the camera. The ...
- 101
0 votes
0 answers
107 views
how do you extend perspective correct linear intepolation to barycentric coordinates?
perspective correct linear interpolation formula is '1/Z = 1/Z0 + α(1/Z1 - 1/Z0)' barycentric one is '1/Z = 1/Z0 + α(1/Z1 - 1/Z0) + β(1/Z2 - 1/Z0)' how can I extend perspective correct linear ...
- 1
1 vote
2 answers
223 views
Is my perspective incorrect?
I am trying to implement a UVN free camera for browsing the 3D space of my OpenGL simulation and I noticed the perspective is introducing some sort of distortion. I observed it is more noticeable ...
- 141
0 votes
1 answer
90 views
How are these two projection matrices related?
I have two 3D perspective projection matrices $A,B$ with standard projection parameters $k=\cot(\theta/2)$, where $\theta$ is the field of view, $n$ is the $z$-near value, $f$ is the $z$-far value, ...
- 157
0 votes
1 answer
128 views
My projection matrix for OpenGL fails on non-symmetric boundaries
Assuming my viewing volume has x coordinates varies from l to r, and y varies from top to bottom, and finally z-axis varies n to f, I derived the following projection matrix: ...
- 23
1 vote
0 answers
52 views
How to get back project point cloud from rendered rgbd images by rgbd?
Given a sequence of RGB-D images rendered by blender and the camera parameters for the blender camera(Perspective Projection camera). How can I back project the RGB images with depth map to a RGB ...
- 11
1 vote
0 answers
44 views
A fresh perspective confusion about a paragraph
I am trying to re-implement the paper "A fresh perspective" In this paper there is one paragraph on secion 2 that reads: Usually, $z_s = z$ is the depth value of the point $P$, unchanged by ...
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