Orientation of axis

[Erik K.]

Hi everyone,

Mathbox's camera by default has its upward orientation to +y direction ([0, 1, 0]). I want to make the z-axis pointed upwards, and this can be done by settings the camera's up position to [0, 0, 1]. However, by setting the up position to +z, it messes up the movement of the camera. 

Is there any way to set the z-axis upwards while maintaining the camera's correct rotation?

thanks

[Erik K.]

Code sample: 

https://gist.github.com/praxxus11/0d30507f0ae947c65b45151eb8670104

[Erik K.]

To those who are reading this from the future:

I couldn't find a nice solution, so I resorted to my initial hack which simply switched the order of coordinates from (x, y, z) to (x, z, y). This means that when drawing on the xy-plane, for instance, you would emit 3 channels: (x, 0, y) as opposed to 2 channels (x, y).

Hope this helps

[Erik K.]

My apologies. It is easier to use the swizzle operator and set swizzle order = [x, z, y]

[Michael]

Hi Erik, is the source of you using swizzle online somewhere? I'm having trouble with the area emit function, and when I try to adjust the limits of the "z"-scale, it's cutting off the emits for y points.

[Sam Ritchie]

One thing I wrapped my head around recently is that, by default, MathBox treats x as left/right, y as up/down, and z as in/out. 

In the constructor, if you pass

camera: {up: new Vector3(0, 0, 1)}

like Chris does here:

https://github.com/ChristopherChudzicki/math3d-react/blob/e352d15d275fc2e060441ecf11574e2fdec3211b/client/src/containers/MathBoxScene/components/MathBoxScene.js#L45-L47

then you can get rid of your swizzles etc.

On Fri, Jul 7, 2023, at 2:35 PM, Michael wrote:

Sorry -- moments later I find that `area` has primitives `rangeX` and `rangeY` to control the sampling emit points independent of the viewed cartesian axis range.

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