[Solved] Final Fantasy style 3D/2D alignment with scrolling

1000h

There is information on the web about how to do orthographic as well as fixed camera, but I cannot figure out how to do panning over 2D background while maintaining alignment with 3D collisions within the shot.

I solved this problem thanks to some people's answers that I read on the Unity forums. The idea is to transform a point by the transformation of the background image, get the vector, clamp the values to the world-space limits based on the image, and then set the camera to that value (plus its initial position)

func cam_behavior(): var sx = cam.get_size()

var ar = sw/sh
var sy = sx/ar

var ap = actor_model.get_child(1).get_translation()
var ipt = ip.get_transform()
var iptr = ip.get_translation()

var rbp = (ipwidth/2 - (sx/2)) 
var lbp = -rbp

var nbp = (ipheight /2 - (sy/2))
var fbp = -nbp

var tbp = (ipheight /2 - (sy/2))
var bbp = -tbp

var tbv =  Vector3(rbp,tbp,nbp)

var xp = clamp(ap[0],-tbv[0],tbv[0])
var yp = clamp(ap[1],-tbv[1],tbv[1])
var zp = clamp(ap[2],-tbv[2],tbv[2])
var v = Vector3(xp,yp,zp)

var xfp = (ip.get_transform().xform(v) / ip.get_scale()[0]) 	

cam.set_translation(xfp+csp)

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Kiori

Thanks for the video man, oh the memories.

Off the top of my head without going into much detail or trying things out i'd think there would be a few ways to do this. Basically you need an image to be in the back and maybe other cut pieces in the front, and you can use shapes, colliders, empty bodies, invisible empty meshes, whatever you need to block the path or create the illusion of 3d. One way I think should work to create the fixed image in the bg is to use a worldEnvironment and set the bg to texture. So it's a different type of skybox. :D

But you can really create whatever illusion you want. You could render things into separate viewports, have a fixed image and transform the character in relation to the distance form the camera(screen), creating a fake perspective effect, anything.

Also, maybe you dont want the characters to change size into the distance then it gets simpler.

Whatever the case, what you want is a fixed bg with 3d characters in the front, moving as if there was a 3d environment around them.

Hope this gives you some ideas, you're gonna have to try things out and find your way. Good luck!

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