GeoJson layer: non-visible feature due to z coordinate in orthographic view

[hoang-ta]

Hello everyone, currently i am displaying GeoJson features with z coordinate in the Orthographic view. My initial view state target is [0,0,800]. You can view my code demo at this sandbox url

• The problem is:

1. Only features whose z values that are smaller than initial view state z target, are visible (green points):
   

2. If I set the initial view state z target to be the highest, green points whose z values are low will disappear on zoom:
   

• What i am trying to solve:

1.Display features with z coordinate (I can do this by setting high value for the initial view state target z). I am stuck at number 2
2. Prevent features disappear on zoom

Thank you for your time.

[Pessimistress]

You can try change the near and far parameters of the OrthographicView.

Ultimately, the z does not matter in orthographic view, and you can flatten your data like so

import {Matrix4} from 'math.gl';

new GeoJsonLayer({
  ...
  modelMatrix: new Matrix4().scale([1,1,0])
});

[hoang-ta]

Thank you, although i'm not sure what really makes it work :)

• I test with near parameter, set its value to negative, decrease it, and it works without setting high value for the initial view state target z (now i can use default [0,0,0])
• As I notice, the lower the near value, the more zoom in I can perform until the object with high z value (red point) disappears.
• I wonder if there is any document about this topic.