Linked Questions

1 vote
0 answers
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Blender View Matrix structure [duplicate]

I am trying to use the Blender cycles standalone plugin with the xna app to render scene. But I am stuck as I don't know the structure of the camera matrix. In xna view matrix structure is this . Can ...
Shivam cv's user avatar
  • 111
2 votes
0 answers
142 views

Python script that takes xyz and returns the perspective matrix vertex coordinates [duplicate]

I've been trying to write a script that receives the xyz coordinates of a vertex of a 3D object and returns the xyz coordinates of the vertex in a prespective projection plane, more or less like in ...
SNunes's user avatar
  • 21
29 votes
2 answers
33k views

3x4 camera matrix from blender camera

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 a camera in Blender, I need ...
rfabbri's user avatar
  • 1,243
7 votes
1 answer
3k views

How to set a custom 4x4 projection matrix in Blender

I have seen some questions to this topic but all of them are not satisfactory for my problem. Is it possible to set a custom 4x4 projection matrix in Python to use for rendering in Blender? I'm not ...
Jonas's user avatar
  • 71
2 votes
1 answer
4k views

Projecting multiple images onto an object with UV Project modifiers

I've just about got to grips with the UV Project modifier. I've unwrapped my object into a UV map with the image I want to project, and then applied it using a camera as a projector. However, I want ...
Chris Watts's user avatar
1 vote
1 answer
4k 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, ...
ktro2828's user avatar
3 votes
1 answer
3k 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 ...
rfabbri's user avatar
  • 1,243
2 votes
1 answer
1k views

How to get the worldspace location of a rendered pixel from Python

I need a way to find the underlying 3D coordinates for each pixel of the camera in Python. I to create a function like: GetCoordinatesForPixel(xPixel, yPixel) which returns a (X, Y, Z) vector. I ...
user1033657's user avatar
0 votes
0 answers
183 views

Camera projection matrix is always the same

I wrote a simple python script to render a scene from different points of view. For each rendered image i also need to save the projection matrix of the camera that took the picture. I try to get the ...
0n430w7's user avatar
0 votes
1 answer
39 views

Recreating clip space coordinates in Blender shader nodes

I've been trying to recreate the clip space coordinate system in Blender's shader nodes. From what I know, the only coordinate systems you have access to are object coordinates (position), world ...
LuigiTKO's user avatar
1 vote
1 answer
23 views

bpy: Defining object location in view coordinates using the projection matrix

I want to scatter multiple objects inside the view frustum of the active camera. In theory it is easy: Generate a random 3D Vector with values in [0..1] Read the projection and camera matrices of the ...
Ismir Egal's user avatar