Extruding front and back distance based on curve

[sant0s81]

Hey,

I have a two pictures of a cave, the side view and the top view and I want to have a rough 3D version of that.
So actually combining the two curves with the shape that I see on the side and top view.

In softimage I would have animated a NULL along the curves to plot a new curve and get the 3D version of the 2D graphics.

My thoughts in Houdini are:

First I match the side view curves (the ceilling and the floor curve) along the curve of the top view, but only on x-axis and z-axis to keep the Y positions.
Than I extrude the Output Front and the Output Back to the height of the two side curves.

Is that possible?

 

Thx alot,
sant0s

 

cave.hiplc

 

[konstantin magnus]

It's called space carving:

 

[sant0s81]

Thx @konstantin magnus

What if I dont have the front?
Can I somehow exclude the code or just fake something?

[konstantin magnus]

Sure, probably like this:

vector bbox = relbbox(0, v@P);

float mask_side  = vector(colormap(image_side, bbox.z, bbox.y)).x;
float mask_top   = vector(colormap(image_top, bbox.x, bbox.z)).x;

f@density = min(mask_side, mask_top);

 

[sant0s81]

@konstantin magnus

I was trying a bit - but somehow I get very strange results.

Do you think, its because of the pictures?

The front image I tried to build from screenshot since I didnt manage to put in you last code

Or are the images to filigran?

I am using these images:

Edited October 21, 2020 by sant0s81