Re: [PyMOL] set_view based on origin and a vector

[Jared S. <jar...@co...>]

Hi Wei -

Fun problem!  Not a "smart" way to do it, but I think functional, using
pseudoatoms and orient to set the view angle:

```
# Create an origin pseudoatom
ori_coords = [0.4017522, 23.15367207, 6.68992345]
cmd.pseudoatom("ori", pos=ori_coords)
color red, ori
show nb_spheres, ori

# Second pseudoatom as a stand-in for the camera
axis = [0.74, 0.18, -0.65]
cam_coords = [sum(x) for x in zip(ori_coords, axis)]
cmd.pseudoatom("cam", pos=cam_coords)

# Adjust the view so the sphere is centered and crosshairs are aligned on
camera Z axis
orient
center ori
turn y, -90

# Print the current view matrix
get_view
```
yields
```
set_view (\
    -0.673201025,    0.023786053,    0.739076912,\
     0.231151611,    0.956164062,    0.179775774,\
    -0.702402592,    0.291863978,   -0.649188757,\
     0.000000000,    0.000000000,  -14.178204536,\
     0.401752204,   23.153671265,    6.689923286,\
    11.178205490,   17.178203583,  -20.000000000 )
```
[image: image.png]

Hope that helps.

Cheers,
Jared


On Fri, Mar 25, 2022 at 12:44 PM Wei Wang <ww...@co...> wrote:

> Dear PyMOL community,
>
> I have a need to adjust my view point in python script. I want to achieve
> the following:
>
>    1. I have a origin with coordinates [ 0.4017522 23.15367207 6.68992345]
>    2. I have a vector/rotation axis [0.74, 0.18, -0.65]
>    3. I want to look directly down that vector using above origin.
>
> Theoretically I should be able to use those information to determine the
> values needed to put in set_view. However, I’m not smart enough to do that.
> Would anyone please show me the way?
>
> Many thanks,
>
> Wei
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