CameraFlightPath.createAnimationCartographic problem positioning the camera...

CesiumJS
1

Hi to all,

First of all, congrats to entire Cesium’s team. I’m new on Cesium. It is really great. Powerful 3D visualization in your web browser without installing anything!!!

I’m programming a 3D viewer and I want to perform some flights and animations between different camera positions.

What is the equivalence between

createAnimationCartographic **destination, direction and up **

and

lookat eye, target and up ???

destination <-> eye

direction <-> target

**up <-> up **

???

I tried with these equivalences but, the result that works OK in lookat, fails (bad camera orientation, 2D positioning ok) in createAnimationCartographic.

Any hints???

Thanks in advance!

2

The direction is a unit vector in the direction you want the camera to look. Target is the actual position being looked at. The mapping would then be:

destination <-> eye

up <-> up

direction <-> target.subtract(eye).normalize()

Also, since eye and target are cartesians, you can use createAnimation instead of createAnimationCartographic.

3

Thanks Daniel!

I tried to do that

Target is a Cartesian3. Eye is a Cartesian3.

target.subtract(eye) works well, but when I tried to aply normalize method I obtain this error:

Uncaught TypeError: Object function (e){return i.normalize(this,e)} has no method ‘cross’

Refering to javascript code of Cesium:

Cesium.js:406

I verified that Cesium is correctly installed and setup (following website instructions, webserver is Apache)

Any hint???

Many thanks in advance again!

4

Can you copy/paste your code? I think you may have forgotten to put parentheses after the call to normalize.

target.subtract(eye).normalize()

5

Thanks Scott.
Thanks Daniel.

I have to normalize also the up vector.

Now it works well!

However I detect that the fly is not smooth… I mean: If I am in a position near to the one I want to flight, the path of the flight is not the shortest, also the flight movement includes some rare twists… I don’t know if this is the normal behavior or there is something that I am not doing right…

Thanks again!