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| // To learn how to write nodes, see https://coollab-art.com/Tutorials/Writing%20Nodes/Intro | ||
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| INPUT float 'Strength'; | ||
| INPUT Point2D 'Charge 1'; | ||
| INPUT float 'Charge 1 Strength'; | ||
| INPUT Point2D 'Charge 2'; | ||
| INPUT float 'Charge 2 Strength'; | ||
| INPUT Point2D 'Charge 3'; | ||
| INPUT float 'Charge 3 Strength'; | ||
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| vec2 force(vec2 pos, vec2 charge_pos, float charge_strength) | ||
| { | ||
| return 'Strength' * charge_strength / dot(pos - charge_pos, pos - charge_pos) * normalize(pos - charge_pos); | ||
| } | ||
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| vec2 main(UV Position) | ||
| { | ||
| return vec2(0.) | ||
| + force(Position, 'Charge 1', 'Charge 1 Strength') | ||
| + force(Position, 'Charge 2', 'Charge 2 Strength') | ||
| + force(Position, 'Charge 3', 'Charge 3 Strength') | ||
| // | ||
| ; | ||
| } |
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| // To learn how to write nodes, see https://coollab-art.com/Tutorials/Writing%20Nodes/Intro | ||
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| INPUT float 'Thickness'; | ||
| INPUT float 'Blur'; | ||
| INPUT int 'Lines'; | ||
| INPUT Point2D 'Pos 1'; | ||
| INPUT Point2D 'Pos 2'; | ||
| INPUT float 'Charge 1'; | ||
| INPUT float 'Charge 2'; | ||
| INPUT float 'Seed'; | ||
| INPUT int 'Max steps'; | ||
| INPUT float 'h'; | ||
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| // https://www.shadertoy.com/view/XsSyzc | ||
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| vec2 E(vec2 p, vec2 q, vec2 q1, vec2 q2) | ||
| { | ||
| return normalize(q.x * (p - q1) / pow(length(q1 - p), 3.) + q.y * (p - q2) / pow(length(q2 - p), 3.)); | ||
| } | ||
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| float line(vec2 p, vec2 a, vec2 b) | ||
| { | ||
| // vec2 dir = normalize(p2 - p1); | ||
| // mat2 inv = mat2(dir.x, -dir.y, dir.y, dir.x); | ||
| // uv = inv * (uv - p1); | ||
| // p2 = inv * (p2 - p1); | ||
| // return float(abs(uv.y) < 'Thickness' && 0. < uv.x && uv.x < p2.x); | ||
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| vec2 ba = b - a; | ||
| vec2 pa = p - a; | ||
| float h = clamp(dot(pa, ba) / dot(ba, ba), 0., 1.); | ||
| return smoothstep(+'Blur', -'Blur', length(pa - h * ba) - 'Thickness'); | ||
| } | ||
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| vec2 RK4(vec2 p, vec2 q, vec2 q1, vec2 q2) | ||
| { | ||
| vec2 k1 = E(p, q, q1, q2); | ||
| vec2 k2 = E(p + 0.5 * 'h' * k1, q, q1, q2); | ||
| vec2 k3 = E(p + 0.5 * 'h' * k2, q, q1, q2); | ||
| vec2 k4 = E(p + 'h' * k3, q, q1, q2); | ||
| return 'h' / 3. * (0.5 * k1 + k2 + k3 + 0.5 * k4); | ||
| } | ||
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| vec2 integrate(float O, vec2 p, vec2 q, vec2 q1, vec2 q2, vec2 start, vec2 end) | ||
| { | ||
| O += line(p, mix(q1, q2, float(length(q1 - start) > 'h' * 1.001)), start); | ||
| vec2 pn; | ||
| vec2 po = start; | ||
| for (int i = 0; i < 'Max steps'; i++) | ||
| { | ||
| pn = po + RK4(po, q, q1, q2); | ||
| O += line(p, po, pn); | ||
| po = pn; | ||
| if (length(end - po) < 'h') | ||
| { | ||
| O += line(p, po, end); | ||
| return vec2(O, -1.); | ||
| } | ||
| if (/* abs(po.x) > iResolution.x / iResolution.y || */ abs(po.y) > 1.0) | ||
| return vec2(O, +1.); | ||
| } | ||
| return vec2(O, +1.); | ||
| } | ||
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| float main(UV uv) | ||
| { | ||
| float O = 0.; | ||
| float prevO = 0.; | ||
| vec2 q1 = 'Pos 1'; | ||
| vec2 q2 = 'Pos 2'; | ||
| vec2 q = vec2('Charge 1', 'Charge 2'); | ||
| float rand = 0.; | ||
| for (float o = 0.; o < TAU; o += TAU / 'Lines') | ||
| { | ||
| float angle = TAU / (2. * 'Lines') + o; | ||
| vec2 os = vec2(cos(angle), sin(angle)) * 0.01; | ||
| vec2 res = integrate(O, uv, q, q1, q2, q1 + os, q2); | ||
| O = res.x; | ||
| if (res.y > 0. && abs(q.y) > 0.) | ||
| { | ||
| res = integrate(O, uv, q.y / abs(q.y) * q, q1, q2, q2 + mat2(-1, 0, 0, 1) * os, q1); | ||
| O = res.x; | ||
| } | ||
| if (O != prevO) | ||
| { | ||
| rand = hash_0_to_1_2D_to_1D(vec2(o, 'Seed')); | ||
| prevO = O; | ||
| } | ||
| } | ||
| return rand; | ||
| } |
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| // To learn how to write nodes, see https://coollab-art.com/Tutorials/Writing%20Nodes/Intro | ||
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| INPUT float 'Grid Size'; | ||
| INPUT float 'Arrow Thickness'; | ||
| INPUT float 'Period'; | ||
| INPUT float 'Color Min'; | ||
| INPUT float 'Color Max'; | ||
| INPUT UV->vec2 'Force Field'; | ||
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| float main(UV uv) | ||
| { | ||
| vec2 gid = floor(uv * 'Grid Size') / 'Grid Size'; | ||
| vec2 guv = fract(uv * 'Grid Size') * 2. - 1.; | ||
| vec2 force = 'Force Field'(gid); | ||
| // force = vec2(-force.y, force.x); | ||
| float angle = atan(force.y, force.x); | ||
| guv = rotation_2D(angle) * guv; | ||
| return mix('Color Min', 'Color Max', sin(length(force) * 'Period') * 0.5 + 0.5) | ||
| * step(-1., guv.x) | ||
| * (1. - step(1., guv.x)) | ||
| * step(-'Arrow Thickness', guv.y) | ||
| * (1. - step(+'Arrow Thickness', guv.y)) | ||
| // | ||
| ; | ||
| } |
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| @@ -0,0 +1,6 @@ | ||
| { | ||
| "value0": { | ||
| "Color": 5, | ||
| "Number of main input pins": 1 | ||
| } | ||
| } |