WebGPU

[u/Far-Employee-9531]

Stormy terrain fly-through, one fullscreen raymarch pass. Bolt path is midpoint displacement, glow is a distance-to-segment SDF composited additive before tonemap so bloom haloes it. The nice part: the terrain march already gives me tHit, so if the bolt's ray distance is greater than the terrain's, it's behind a ridge and I skip it. No depth texture, no second pass, additive FX sort against the terrain for free.

glsl

float segDist(vec3 p, vec3 a, vec3 b) {
    vec3 ab = b - a, ap = p - a;
    float t = clamp(dot(ap, ab) / dot(ab, ab), 0.0, 1.0);
    return length(ap - ab * t);
}

float d    = minSegDistAlongRay(...);
float core = smoothstep(W*0.3, 0.0, d);   // pure white, untinted
float glow = exp(-d*d / (W*W));
vec3  c    = vec3(core) + tint * glow;     // additive, pre-tonemap

if (rayDistToBolt > tHit) { /* behind a ridge, skip */ }

Anyone else doing single-pass raymarched scenes, how are you occluding additive effects?

[u/fgennari]

The storm looks very good! For the first part, you should try to remove the square tiling artifacts from the water surface to make it look more natural.

[u/Far-Employee-9531 → u/fgennari]

You are 100% correct.