perspective match issue

[mitviz]

sometimes when doing a perspective match from an aerial cam it works ok, sometimes not, not sure why, someone sent me this scene to help them with but not sure what is the cause, i usually just create a box over the model to match to the scene background but would just like to know why this issue even happens
https://vimeo.com/211609319

[jacksc02]

That is the worst tool ever. I have never been able to get it to work properly.
I find it so much easier to do it manually

[mitviz]

That is the worst tool ever. I have never been able to get it to work properly.
I find it so much easier to do it manually

well i got it to work, now but had to close and reopen max and make sure not make the lines come or cross each other while matching and also move the blue then green and then red in that order but sometimes it just does this idk

[Deflaminis]

Yeah it does this. It's not really bug but it gets confused about things once in a while. My experience has been that if this happens, just start moving some of the other lines first. The problem is that it can't make sense of your line placement until those green ones are a bit more in place. Every time this has happened to me, moving other lines first fixes the issue for me. Sometimes it a bit finicky, but this should help.

[mitviz]

Yeah it does this. It's not really bug but it gets confused about things once in a while. My experience has been that if this happens, just start moving some of the other lines first. The problem is that it can't make sense of your line placement until those green ones are a bit more in place. Every time this has happened to me, moving other lines first fixes the issue for me. Sometimes it a bit finicky, but this should help.

yeah i figured that, wish they had an option to freeze other lines

[Deflaminis]

Yeah that would be cool. I'd like to see it recognize barrel distortion but I don't know how hard that is. I mostly use this tool to model when I only have a single photo of a product or item at an angle. I think it makes it way easier to approximate distance between details.

[Morne]

The Sketchup one I found works way better in this regard

[Richard7666]

That is the worst tool ever. I have never been able to get it to work properly.
I find it so much easier to do it manually

The tool does work, but it won't work properly with physical cams, and this isn't mentioned anywhere. Only standard non-physical cams. Took me ages to realise this. You can set up two axes properly, but the third one will result in the lines of the first one moving, as it tries to respect the camera FOV settings or something.
It is kind of a half-arsed tool though, there's not even a reset lines option.

Anyway what I do is use a standard free cam, set it up, then use this script to convert that camera to a physical camera.

old_cameras = $Camera* as array --No Vray convertion neded
old_cameras = (for o in old_cameras where classof o == Targetcamera or classof o == Freecamera collect o)
if selection.count==1 then
(
if classof (selection[1]) == Targetcamera do
(
old_cameras = #((selection[1]))
)
)else()

for old_cam in old_cameras do
(
new_camera = Physical_Camera()
new_camera.transform = old_cam.transform
new_camera.specify_fov = true
new_camera.name = "(phy)" + old_cam.name

if old_cam.type == #free then (
new_camera.targeted = false
) else (
new_camera.targeted = true
new_camera.target.transform = old_cam.target.transform

)

for prop_name in getPropNames old_cam do
(
if hasProperty new_camera prop_name then (
prop_value = getProperty old_cam prop_name
setProperty new_camera prop_name prop_value
)
)
)

credit to jens.diemer at https://forums.autodesk.com/t5/3ds-m...a/td-p/5599954
That thread is worth a read.