POM material

[dokipen (Dan 'dokipen' Elliott)]

@zalo;319452

mentioned Ray Marching for Volume Rendering, and I figured I’d save him some time since I did a little while ago just after we got texture sampling from custom nodes.

http://i.imgur.com/Z5MoBGc.png

Here are the assets:

http://i.imgur.com/EdrLlmU.jpg

http://i.imgur.com/XcKUv2g.png

And the custom node (which is kind of messy, but it was my first custom node):

float totalValue = 0.0;
int steps;float3 p;
int slice;
float2 cornerpos;
float2 coord;
float4 value;
for (steps=0; steps < MaximumRaySteps; steps++)
{
p = (((from + (direction* StepLength*steps))-position));
slice = ((p.z/height)*(rows*columns))+(rows*columns/2);
cornerpos = float2(((slice%columns)/columns), floor(slice/columns)/rows);
coord = cornerpos + float2(((p.x/width)+0.5)/columns,((p.y/length)+0.5)/rows);
if((abs(p.x)>width/2)+(abs(p.y)>length/2)+(abs(p.z)>height/2)+(distance(p+position,CameraOrigin)>Depth) < 1) totalValue += Texture2DSample(Tex,TexSampler,coord).r*(Density);
}
return totalValue;

It’s pretty basic; I look forward to seeing how volume rendering evolves in UE4 ('s distance field ray marching materials look sweet)!

Nice. Although I managed to get my own working the other day using probably the same technique…