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fix twister & rain effects #211

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Oct 31, 2025
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fix twister & rain effects #211

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23 changes: 15 additions & 8 deletions examples/splat-reveal-effects/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -194,11 +194,12 @@
}
// Twister weather effect
vec4 twister(vec3 pos, vec3 scale, float t) {
float h = hash(pos).x + .1;
vec3 h = hash(pos);
float s = smoothstep(0., 8., t*t*.1 - length(pos.xz)*2.+2.);
if (length(scale) < .05) pos.y = mix(-10., pos.y, pow(s, 2.*h));
pos.xz = mix(pos.xz*.5, pos.xz, pow(s, 2.*h));
pos.xz *= rot(t*.2 + pos.y*20.*(1.-s)*exp(-1.*length(pos.xz)));
if (length(scale) < .05) pos.y = mix(-10., pos.y, pow(s, 2.*h.x));
pos.xz = mix(pos.xz*.5, pos.xz, pow(s, 2.*h.x));
float rotationTime = t * (1.0 - s) * 0.2;
pos.xz *= rot(rotationTime + pos.y*20.*(1.-s)*exp(-1.*length(pos.xz)));
return vec4(pos, s*s*s*s);
}

Expand All @@ -208,7 +209,6 @@
float s = pow(smoothstep(0., 5., t*t*.1 - length(pos.xz)*2. + 1.), .5 + h.x);
float y = pos.y;
pos.y = min(-10. + s*15., pos.y);
pos.x += pos.y*.2;
pos.xz = mix(pos.xz*.3, pos.xz, s);
pos.xz *= rot(t*.3);
return vec4(pos, smoothstep(-10., y, pos.y));
Expand Down Expand Up @@ -253,14 +253,21 @@
// Twister Effect: swirling weather reveal
vec4 effectResult = twister(localPos, scales, t);
${outputs.gsplat}.center = effectResult.xyz;
${outputs.gsplat}.scales = mix(vec3(.005), scales, pow(effectResult.w, 30.));
${outputs.gsplat}.rgba.a = pow(effectResult.w, .7) * smoothstep(30., 0., length(localPos.xz));
${outputs.gsplat}.scales = mix(vec3(.002), scales, pow(effectResult.w, 12.));
float s = effectResult.w;
// Also apply a spin (self-rotation) so each splat rotates about its own center.
float spin = -t * 0.3 * (1.0 - s);
vec4 spinQ = vec4(0.0, sin(spin*0.5), 0.0, cos(spin*0.5));
${outputs.gsplat}.quaternion = quatQuat(spinQ, ${inputs.gsplat}.quaternion);
} else if (${inputs.effectType} == 5) {
// Rain Effect: falling streaks
vec4 effectResult = rain(localPos, scales, t);
${outputs.gsplat}.center = effectResult.xyz;
${outputs.gsplat}.scales = mix(vec3(.005), scales, pow(effectResult.w, 30.));
${outputs.gsplat}.rgba.a = pow(effectResult.w, .7) * smoothstep(30., 0., length(localPos.xz));
// Also apply a spin (self-rotation) so each splat rotates about its own center.
float spin = -t*.3;
vec4 spinQ = vec4(0.0, sin(spin*0.5), 0.0, cos(spin*0.5));
${outputs.gsplat}.quaternion = quatQuat(spinQ, ${inputs.gsplat}.quaternion);
}
`),
});
Expand Down