I want to change the projection to have a real plan view. In cesium the corners are not at 90 degrees.
Is the camera’s view direction perpendicular to the map?
For instance, when you zoom out all the way, which of the following maps does it look like:
the coordinates are “Cesium.Cartesian3.fromDegrees(-3.835455,40.405785, 1900)”
I think what you are looking for is WebMercatorProjection. Here is an example: Sandcastle link.
it was that, thank you.