Hi, I want to use imodel.js To achieve roaming along the specified path.

[shenshengyi]

Hi, I want to use imodel.js Realize roaming along the specified path. For example, if I draw a path and then roam along the path, can you provide me with an idea? thank you.

[pmconne]

Implement a viewport animator and apply it to a Viewport.
In your Animator's animate function, interpolate along your path based on the time elapsed to determine where the camera should be positioned and how it should be oriented. You may find functions like fractionToPoint useful for this. Then adjust the viewport's frustum correspondingly.
Return true from animate when you reach the end of your path, to terminate the animation.

[shenshengyi]

Implement a viewport animator and apply it to a Viewport.
In your Animator's animate function, interpolate along your path based on the time elapsed to determine where the camera should be positioned and how it should be oriented. You may find functions like fractionToPoint useful for this. Then adjust the viewport's frustum correspondingly.
Return true from animate when you reach the end of your path, to terminate the animation.

Thank you very much for your answer. I'll implement it in this way.