koobas.hobune.stream
Render a 3d world as a 2d slice
Hello, I need a way to render the cross-section of a plane (camera) and all the meshes on the scene. My camera is orthographic and has a far clip plane of 1. That means that the typical cross-section shader will not work, because that only works with depth. I have tried raymarching, and it worked perfectly, but I dont want to be limited to signed distance fields.
Hey, I am looking for the exact same thing as you. Have you come to any solution yet?
A while back i made a fragment shader that was able to get world positions and discard them when above z=0 (i was making a cross section on z = 0) i also had the problem that i could not make it work with normal camera depth as my camera is doing some weird off axyl custom matrix rendering and my 'slicing' needed to be done straight..
its been a while so poke me again if u cant make it work.
adding a field to the v2f struct:
float4 worldSpacePosition : TEXCOORD0;
filling that field in the vert function:
o.worldSpacePosition = mul(unity_ObjectToWorld, v.vertex);
using the field int he frag function to discard pixels.
float4 pixelWorldSpacePosition = i.worldSpacePosition;
if (pixelWorldSpacePosition.z < 0)
{
discard;
}
i can remember u had to add this line to make it work:
Blend SrcAlpha OneMinusSrcAlpha
I think this should be enough info to make this shader, let me know if u cant make it work than i'll clean up my code next week and post a shader here.
