Linked Questions
15 questions linked to/from 3x4 camera matrix from blender camera
39
votes
7
answers
23k
views
How to find image coordinates of the rendered vertex?
I have a simple mesh of a cube. I would like to know what are the coordinates of each vertex in the rendered image (i.e. for each 3d vertex I'd like to know it's pixel coordinates). Is there a way ...
- 615
15
votes
3
answers
16k
views
How can I get the camera's projection matrix?
As asked.
I need a way to get the projection matrix of the active camera, via python.
EDIT: I think this question is different from the one asked here, because getting a matrix is different from ...
- 1,051
9
votes
1
answer
8k
views
What is blender's camera projection matrix model?
I have question what is blender's camera projection model.
I want to use blender to my computer vision experiment which need to compare real photo and CG. For real photo, I used camera matrix K for ...
- 167
5
votes
1
answer
3k
views
Distortion Coefficients and Camera intrinsic of blender's cameras?
I'm looking to run a SLAM algorithm over images generated from blender but I need to know the intrinsic properties of the camera. I've taken a brief look at the python api and there doesn't seem to be ...
- 53
3
votes
1
answer
2k
views
blender camera from 3x4 matrix
In computer vision, the transformation from 3D world coordinates to pixel coordinates is often represented by a 3x4 (3 rows by 4 cols) matrix P as detailed below. Given P I need code to return a ...
- 1,154
1
vote
1
answer
1k
views
what is the meaning of 4x4 projection matrix?
I want to know the meaning of 4x4 projection matrix and how can I transform it 3x4 usual shape.
I understand that, in Blender, I can compute projection matrix as following,
...
- 27
4
votes
1
answer
1k
views
How can I get the projection matrix of a panoramic camera with a fisheye equisolid lens?
I am working on a project in which i used the panoramic camera with fisheye equisolid lens on Cycles render. For some tests, I need the projection model that uses by this camera to project a 3D point ...
- 1,952
0
votes
0
answers
1k
views
How to project a point from 3D to 2D in blender?
I know how to obtain the 4x4 projection matrix of the camera in Blender, but it seems its format is different from the standard camera projection matrices. I would appreciate it if someone explains ...
- 153
1
vote
0
answers
605
views
How to compute image coordinates from projection matrix?
I get the projection matrix from the Camera object (projection_matrix) and it is a 4x4 matrix. I have an object in the scene whose "worldPosition" is known (x,y,z). Now I want to project the 3D point (...
- 153
3
votes
0
answers
331
views
stereo camera extrinsic parameter
In Blender, we have an option to make Blender camera to be a stereo system. I found this post very helpful in getting the camera parameters (including intrinsic and extrinsic parameters). Yet, the ...
- 437
2
votes
2
answers
212
views
How to set object at a specific depth from the camera, at a certain pixel
I want to set an object at a certain distance (or depth) relative to the camera; and also at a particular pixel.
Example:
I set up a camera at a random position in blender. I want an 1280x720 image. ...
- 183
1
vote
0
answers
178
views
Homography between two planes with rotation and translation
I generated two camera views using Blender with rotation and translation.
Now I want to know how to compute homography between camera view A to B?
I found how to compute homography for rotation only ...
- 11
3
votes
1
answer
92
views
What Lens Model does Blender use for Camera Tracking?
I recently started working with the camera-tracking estimator to produce short augmented reality videos. I'd like to learn more about the lens model and its parameters (K1, K2, etc...).
Can anyone ...
- 141
3
votes
1
answer
42
views
What does the @-operator do?
I've been trying to figure out what the @ in the following code does:
T_world2bcam = -1*R_world2bcam @ cam.location
where ...
- 33
0
votes
1
answer
49
views
How to calculate the transformation from the pivot point to each stereo camera
I checked the API documentation and this related question, and it looks like there is no easy way to get the pose of both the left-stereo and right-stereo cameras. So, I think the only solution is to ...
