Best way to switch between camera options

This topic has 9 replies, 2 voices, and was last updated 4 years, 8 months ago by Yuri Kovelenov.

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2020-03-23 at 11:06 am #24871

web
Customer

I having a hard time to implement a good working “camera switching” in my application.

I need to implement switching between different camera options triggered by the user:
– Camera with only orbit (limited angles) and zoom allowed no panning
– Camera with orbit (still limited angles), zoom and panning.
– “2D” locked camera. Just top viewing with no orbit, just zoom and panning.

Because as far as I know its impossible at the moment to change camera settings at runtime. I created different cameras. I can switch between them, but I’m having a hard time to get a smooth transition between the cameras. I get strange jumpings, etc. I just want the change between the cameras become “invisible”.

I would also be okay with creating camera programtically, but I couldnt find any information in the developer api to set options/limits for a perspective camera.

Any ideas?

2020-03-23 at 2:28 pm #24900

Yuri Kovelenov
Staff

Hi,

web wrote:

I get strange jumpings, etc. I just want the change between the cameras become “invisible”.

likely the problem is that when you switch between cameras, the current camera position does not fit in the limits imposed by the previous camera. A possible solution may be that you smoothly reset the camera to some predefined ‘safe’ position before switching it

Chief 3D Verger | LinkedIn | Twitter

2020-03-23 at 4:01 pm #24914

web
Customer

Hmm okay, will have a look.

Can you tell me if it is possible to create a camera directly in javascript with limits/restrictions?

2020-03-24 at 12:35 pm #24945

Yuri Kovelenov
Staff

yes, I think it should be possible with JavaScript

Chief 3D Verger | LinkedIn | Twitter

2020-03-24 at 2:11 pm #24960

web
Customer

I already saw that entry, but I couldnt find description in the api to set camera limits.

2020-03-26 at 8:39 am #24987

Yuri Kovelenov
Staff

Sorry, the right page is
https://www.soft8soft.com/docs/api/en/controls/OrbitControls.html

you should use app.controls to access these properties and methods.

Chief 3D Verger | LinkedIn | Twitter

2020-03-26 at 11:32 am #24993

web
Customer

Thx, this looks promising.

Do you have to create the camera object pure in javascript or can you get a scene camera and alter the settings?

2020-03-26 at 12:17 pm #24995

Yuri Kovelenov
Staff

EDIT
Controls are changed independently from the camera, e.g.
app.controls.minDistance = 2

Chief 3D Verger | LinkedIn | Twitter

2020-03-26 at 12:44 pm #24998

web
Customer

Got it.

app. didnt work for me in the prepareExternalInterface function. Got undefined error for “enableZoom” for example. But implementing a function into the “visual_logic.js” via appInstance.controls.enableZoom = false did work for me.

2020-03-26 at 12:46 pm #25000

Yuri Kovelenov
Staff

web wrote:

didnt work for me in the prepareExternalInterface function

try making it inside runCode()

Chief 3D Verger | LinkedIn | Twitter
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