Get z position of camera and current layer

[AnmolM]

For a project, I would like to get the z position of camera and current layer. Is there a simple way to :- 

a. Check if The 3d layer is enabled for current layer

b. If enabled, get x,y,z position of camera and current layer.

Artie is a bit involved as a simple example to just get this info.

[AnmolM]

This is what I am trying to do in c++ sdk

d = length(toWorld(anchorPoint),thisComp.activeCamera.position);

[James Whiffin]

To check if a layer is 3D, you can query it's flags (same as to check if it's an adjustment layer, cont raster, has moblur, etc). 

The resizer example in the SDK gets a 3D camera and transforms. AEGP_GetLayerToWorldXform is very handy as it accounts for all parented transforms. 

[AnmolM]

Is there an example where AEGP_GetLayerToWorldXform will take the matrix and spit out the camera position in world co-ordinates ?

[AnmolM]

This is the ExtendScript equivalent - 

"function camPos() \
 {if (app.project.activeItem.activeCamera != null) \
     return app.project.activeItem.activeCamera.transform.position.value;\
 else \
     return [0,0,0];\
 }\
 camPos();"

[AnmolM]

For reference, the camera matrix is obtained by - 

ERR(suites.PFInterfaceSuite1()->AEGP_ConvertEffectToCompTime(in_data->effect_ref, in_data->current_time,	in_data->time_scale, &comp_timeT));

ERR(suites.PFInterfaceSuite1()->AEGP_GetEffectCamera(in_data->effect_ref,&comp_timeT,&camera_layerH));
		
if (!err && camera_layerH){
	ERR(suites.LayerSuite5()->AEGP_GetLayerToWorldXform(camera_layerH,&comp_timeT, &matrix));
// Now obtain camera position
}

[AnmolM]

I got the position of the camera as 

matrix.mat[3][0], matrix.mat[3][1], matrix.mat[3][2] - I use this as x,y,z 

[James Whiffin · Accepted solution]

You can also use the math suite to decompose the matrix into it's components 

ERR(suites.MathSuite1()->AEGP_MatrixDecompose4(&layer2WorldMat, &posVP, &scaleVP, &shearVP, &rotVP));

[AnmolM]

Thanks, I was not aware of this.