Help with jit.gl.multiple and camera position/rotation

OK, I will try to simplify the question:
Is there an easy way to do a 3d transformation (combined position and rotation) to a matrix?
This matrix contains object position coordinates for jit.gl.multiple.

I have a matrix with object positions.
I move and rotate the gl camera and get position and rotation information (getposition,getrotatexyz).
I want to transform (translate/rotate) the original matrix and obtain a new one that contains the new object positions in regard to the camera's position and rotation.

Any tips out there? Thanks.

I guess I'm talking with myself here, but anyway here it goes, in case anyone searches the forum in the future...
I've had some problems coming with the answer because to simulate jit.gl.camera's rotation, the calculation order needed to be YZX instead of XYZ. Maybe there's an easier answer, but this one works and I guess is efficient.

I don't have an answer to your question but that video is gorgeous. I would love to know how you did the trails in that. It looks like you are storing a fixed length history of geometry data, passing it to a [jit.gl.mesh] and drawing it with a texture that has partial transparency? Something like that?

Hi, Jadie.Thanks for the kind comments regarding the video!

You are absolutely correct in your assumption about the process employed:
I send a one-column matrix to jit.gl.multiple to define the object positions and draw the spheres.
This matrix is also sent to the leftmost column of a multi-column matrix. On each frame, that column is offset 1 pixel to the right, making a memory system with the previous positions.
The object used to transform the matrix to geometry is indeed jit.gl.mesh with several "draw_mode" configurations: quad_strip, tri_strip. line_strip, quads or points. jit.gl.mesh's colour is semi-transparent.
Then I capture the whole scene to texture and process it with a blur-based feedback system.
The camera can be fixed or dynamic. When in "dynamic mode", it follows one of the objects with a certain offset (using position and lookat messages).

Here's an update to the solution I've posted above. The gen code was simplified and I've deleted a few unnecessary objects.

Hi,
this was mesmerizing ! thanks ! btw i might reuse your patch to learn how to navigate through a virtual space using jit.gl.camera and a joystick. So thanks again :)

Hey, it's me again.

So thanks to the "matrix translation and rotation" thingy, i could do something to navigate inside your 3d opengl scene, with controls alike those of a FPS game (using arrows and mouse). It will be useful to me at least. Here it is :

this makes me think that perhaps i missed something very obvious with jit.gl.camera, cause i would have thought you could "recenter" the view at each point where you are, so that you can go from that point and navigate relatively to each position you're at, not the original origin point... or do you need to recalculate the matrix each frame to do this ? i guess that was your point since the beginning of this thread then...

Hi, vichug. Thanks for your comments!
The patch I posted needs Max 6, as the main purpose of it resides inside jit.gen and it is also using jit.gl.camera and attrui.
The patch you posted is a Max 5 patch that has nothing on it. I don't know what might have happened... post the patch again if you need further help.

Just to clear some doubts:
You don't need my solution to navigate in an OpenGL scene. I guess you could do it better with jit.gl.camera and jit.anim.drive, although I've never tried it...

What I wanted to exemplify in my patch was how to calculate the relative position and orientation of objects to the camera.
So, in this mode, instead of moving/rotating the camera, the camera is fixed (0, 0, 0), I calculate the equivalent transforms and apply it to the scene objects instead. I move the objects and not the camera.
The visual end result is the same, but I do this not to render the images but to calculate the sound of each object in regard to camera proximity and orientation.

hm, this is indeed odd. I might have done something wrong, here i try again. And now that i'm trying, i realize that there might be a problem with my Max, cause it always pastes saying "max5_patcher"

Anyway, calculating the sound of each object in regard to camera proximity and orientation is undoubtedly something i'm very interested in ! though i don't really know how to do it, cause i'm a beginner with Jitter, and i'm doing the Jitter tutorials nowadays, so i'll probably understand it later.