Camera Lens Length

Grasshopper
1

Hello; maybe this question related to Rhino more than Grasshopper or to both of them.

Fspy : is an Open source still image camera matching and Blender can import fspy file directly

Fspy unlike Rhino don’t export XYZ euler coordinations; so i use this method to get them.

  1. -Export Json file from Fspy
  2. -Extract matrix transformation of the camera
  3. -Get XYZAB from the matrix with FURobot plugin
  4. -Rotate XY plane with Pufferfish Rotate Euler
  5. -Create camera with Horster plugin
  6. -I use the image as background and the camera matched good.

Now i have one problem: Lens length ; Fspy export FOV . Blender read it and we can easily switch from FOV to Focal Length
The question how we can get Lens length (Focal Length) from FOV?

2
21312×762 122 KB

1
11473×678 111 KB

c
c1473×678 153 KB

g
g1412×707 83.8 KB

2

Problem Solved: i use width of the sensor = 32

q1
q1.JPG1154×246 41.3 KB

q2
q2.JPG916×339 23.6 KB

3

hi @anon39580149 ,
Do you mind sharing the script?
Maybe this could be implemented into small py script :open_mouth: !
Thanks
CC