// VIDEO TORUS 3D — the clip wrapped right around a fat revolving ring: u
// runs around the major circle, v around the tube, so the picture bends
// through real perspective as the ring leans and turns. A hot highlight
// ring chases around the torus once per beat. Pattern taught here: the
// torus surface uv as a video map, and a beat-phase sweep along uv.x.
{
    name: "Video Torus 3D"
    engine: "videomesh"
    shape: "torus"
    seed: 6

    detail: 40
    size: 3.6
    fly: 0.7

    beat_pulse: 0.45
    input0: "test"

    color_bg: #x060512
    color_a: #x40e8c0
    color_b: #xe84f9a
    color_c: #xe6fff6

    fog: 0.015
    glow: 1.0

    stages: [
        {kind: "bloom", threshold: 0.7, strength: 0.8, levels: 2}
    ]

    // THE LOOK LIVES HERE — the wrapped texel plus the beat chaser:
    // sweep = distance (around the ring) from the beat-phase point.
    shader: draw.DrawVjFxVideomesh {
        fx_axis: fn(id: float, hash: float) -> vec3 {
            return vec3(0.3, 1.0, 0.15)
        }
        fx_place: fn(id: float, hash: float, t: float) -> vec4 {
            return vec4(0.0, 0.0, 0.0, t * 0.4 * (1.0 + clamp(self.user.x, 0.0, 4.0)))
        }
        fx_color: fn(t: float, attr: vec4, content: vec4, cmix: float) -> vec4 {
            let d = abs(fract(self.v_uv.x - self.time_beat.z + 0.5) - 0.5) * 2.0
            let chase = 1.0 - smoothstep(0.0, 0.16, d)
            let lit = content.xyz * t
            let hot = self.col_a.xyz * chase
                * (0.5 + self.time_beat.w * 1.2 + clamp(self.user.z, 0.0, 4.0))
            return vec4((lit + hot) * self.fog.y, 1.0)
        }
    }
}