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shroom.js
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shroom.js
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function shroom({position, rotation, convex,
stipe_radius, stipe_shape, stipe_rSegments, stipe_vSegments, stipe_color,
pileus_shape, pileus_radnoise, pileus_angnoise, pileus_surfnoise, pileus_rSegments,
pileus_cSegments, pileus_rimSegments, pileus_thickness, pileus_scale, pileus_color,
pileus_rotation_offset,
plates_height, plates_num, plates_resolution, plates_surfnoise, plates_color,
dots_num, dots_radius,
hasskirt, skirt_height, skirt_radnoise, skirt_angnoise, skirt_surfnoise, skirt_rotation_offset, skirt_shape,
skirt_color, skirt_scale, skirt_thickness
}) {
if (!position) position = new THREE.Vector3(0,0,0);
if (!rotation) rotation = new THREE.Quaternion();
if (!convex) convex = false;
if (!stipe_radius) stipe_radius = (a, t) => {return 1};
if (!stipe_shape) stipe_shape = new THREE.CatmullRomCurve3( [ new THREE.Vector3( 0, 0, 0 ), new THREE.Vector3( 0, 10, 0 ), ], closed=false );
if (!stipe_rSegments) stipe_rSegments = 20;
if (!stipe_vSegments) stipe_vSegments = 40;
if (!stipe_color) stipe_color = (a, t) => {return [1, 1, 1]};
if (!pileus_shape) pileus_shape = new THREE.CatmullRomCurve3( [ new THREE.Vector3( 0, 0, 0 ), new THREE.Vector3( 3, -1, 0 ), ], closed=false );
if (!pileus_radnoise) pileus_radnoise = (a, t) => {return 0};
if (!pileus_angnoise) pileus_angnoise = (a, t) => {return 0};
if (!pileus_surfnoise) pileus_surfnoise = (a, t) => {return 0};
if (!pileus_color) pileus_color = (a, t) => {return [1, 1, 1]};
if (!pileus_rSegments) pileus_rSegments = 30;
if (!pileus_cSegments) pileus_cSegments = 40;
if (!pileus_rimSegments) pileus_rimSegments = 10;
if (!pileus_thickness) pileus_thickness = 0.2;
if (!pileus_rotation_offset) pileus_rotation_offset = 0;
if (!pileus_scale) pileus_scale = 1;
if (!plates_height) plates_height = 0.8;
if (!plates_num) plates_num = 30;
if (!plates_resolution) plates_resolution = 20;
if (!plates_surfnoise) plates_surfnoise = (a, t) => {return 0};
if (!plates_color) plates_color = (a, t) => {return [1, 1, 1]};
if (!dots_num) dots_num = 0;
if (!dots_radius) dots_radius = 1;
if (!hasskirt) hasskirt = false;
if (!skirt_height) skirt_height = 0.9;//plates_height;
if (!skirt_radnoise) skirt_radnoise = (a, t) => {return 0};
if (!skirt_angnoise) skirt_angnoise = (a, t) => {return 0};
if (!skirt_surfnoise) skirt_surfnoise = (a, t) => {return 0};
if (!skirt_rotation_offset) skirt_rotation_offset = 0;
if (!skirt_shape) skirt_shape = new THREE.CatmullRomCurve3( [ new THREE.Vector3( 0, 0, 0 ), new THREE.Vector3(stipe_radius(0, skirt_height - 0.1), -stipe_shape.getPointAt(1).sub(stipe_shape.getPointAt(skirt_height - 0.1)).y, 0), ], closed=false );
if (!skirt_color) skirt_color = (a, t) => {return [1, 1, 1]};
if (!skirt_scale) skirt_scale = 1;
if (!skirt_thickness) skirt_thickness = 0.1;
// STIPE
var stipe = new THREE.BufferGeometry();
var stipe_points = [];
var stipe_indices = [];
var stipe_colors = [];
var local_points;
var local_translation;
var tangent;
var q = new THREE.Quaternion();
for (var t = 0; t < 1; t += 1 / stipe_vSegments) {
var curve = new THREE.CatmullRomCurve3( [
new THREE.Vector3( 0, 0, stipe_radius(0, t)),
new THREE.Vector3( stipe_radius(Math.PI / 2, t), 0, 0 ),
new THREE.Vector3( 0, 0, -stipe_radius(Math.PI, t)),
new THREE.Vector3( -stipe_radius(Math.PI * 1.5, t), 0, 0 ),
], closed=true, curveType='catmullrom', tension=0.75);
local_points = curve.getPoints( stipe_rSegments );
tangent = stipe_shape.getTangentAt(t);
q.setFromUnitVectors( new THREE.Vector3( 0, 1, 0 ), tangent );
local_translation = stipe_shape.getPointAt(t);
for (var i = 0; i < local_points.length; i++) {
var a = 2 * Math.PI / local_points.length * i;
var v = local_points[i];
v.applyQuaternion( rotation )
v.applyQuaternion( q );
stipe_points.push(v.x + local_translation.x, v.y + local_translation.y, v.z + local_translation.z);
stipe_colors.push(...stipe_color(a, t))
}
}
for (var i = 0; i < stipe_vSegments - 1; i ++) {
for (var j = 0; j < stipe_rSegments; j ++) {
stipe_indices.push(i * (stipe_rSegments + 1) + j,
i * (stipe_rSegments + 1) + j + 1,
(i + 1) * (stipe_rSegments + 1) + j);
stipe_indices.push(i * (stipe_rSegments + 1) + j + 1,
(i + 1) * (stipe_rSegments + 1) + j + 1,
(i + 1) * (stipe_rSegments + 1) + j);
}
}
stipe.setAttribute('position', new THREE.BufferAttribute(new Float32Array(stipe_points), 3));
stipe.setAttribute('color', new THREE.BufferAttribute(new Float32Array(stipe_colors), 3));
stipe.setIndex(stipe_indices);
stipe.computeVertexNormals();
stipe.translate(position.x, position.y, position.z);
// PILEUS
var pileus = new THREE.BufferGeometry();
const pileus_rotation = stipe_shape.getTangentAt(1);
const pileus_position = stipe_shape.getPointAt(1).add(pileus_rotation.clone().multiplyScalar(1));
var pileus_points = [ pileus_shape.getPoint(0).x, pileus_shape.getPoint(0).y, pileus_shape.getPoint(0).z ];
var pileus_indices = [];
var pileus_normals = [];
var pileus_colors = [0,0,0];
var pileus_rotation_offset_q = (new THREE.Quaternion()).setFromAxisAngle(pileus_rotation, pileus_rotation_offset);
const z1 = new THREE.Vector3(0,0,1);
q.setFromUnitVectors( new THREE.Vector3( 0, 1, 0 ), pileus_rotation );
var rim_da = new THREE.Quaternion();
rim_da.setFromAxisAngle ( new THREE.Vector3(0, 0, -1), Math.PI / pileus_rimSegments )
var rim_local_vector = new THREE.Vector3(0,0,0);
function pileus_surface(a, t, rim_it=0) {
var noisyt = t * (1 + pileus_radnoise(a, t));
if (noisyt > 1) noisyt = 1;
if (noisyt < 0) noisyt = 0;
var shape_point = pileus_shape.getPointAt(noisyt).multiplyScalar(pileus_scale);
var tangent = pileus_shape.getTangentAt(noisyt);
var noisev = new THREE.Vector3(0,0,0);
noisev.crossVectors(z1, tangent);
var rim_local_vector = tangent.multiplyScalar(pileus_thickness).multiplyScalar(rim_it / pileus_rimSegments);
if (rim_it == 0) rim_local_vector = new THREE.Vector3(0,0,0);
for (var k = 0; k < rim_it; k ++) rim_local_vector.applyQuaternion(rim_da);
var surface_point = new THREE.Vector3(0,0,0);
surface_point.x = Math.cos(a + pileus_angnoise(a, noisyt)) * (shape_point.x + rim_local_vector.x);
surface_point.y = shape_point.y + rim_local_vector.y;
surface_point.z = Math.sin(a + pileus_angnoise(a, noisyt)) * (shape_point.x + rim_local_vector.x);
var surfnoise_val = pileus_surfnoise(a, noisyt);
surface_point.applyQuaternion(q);
surface_point.applyQuaternion(pileus_rotation_offset_q);
surface_point.x = surface_point.x + noisev.x * Math.cos(a) * surfnoise_val;
surface_point.y = surface_point.y + noisev.y * surfnoise_val;
surface_point.z = surface_point.z + noisev.x * Math.sin(a) * surfnoise_val;
return surface_point;
}
// PILEUS SURFACE
for (var i = 1; i <= pileus_rSegments; i++) {
var t = Math.pow(1 / pileus_rSegments * i, 0.9);
for (var j = 0; j < pileus_cSegments; j++) {
var a = Math.PI * 2 / pileus_cSegments * j;
var surface_point = pileus_surface(a, t);
pileus_points.push(surface_point.x, surface_point.y, surface_point.z);
pileus_colors.push(...pileus_color(a, t));
}
}
// RIM
for (var i = 1; i < pileus_rimSegments; i++) {
for (var j = 0; j < pileus_cSegments; j++) {
var a = Math.PI * 2 / pileus_cSegments * j;
var surface_point = pileus_surface(a, 1, i);
pileus_points.push(surface_point.x, surface_point.y, surface_point.z);
pileus_colors.push(...pileus_color(a, 1));
}
}
for (var i = 0; i < pileus_rSegments + pileus_rimSegments - 2; i ++) {
if (i == 0) for (var j = 0; j < pileus_cSegments; j ++) pileus_indices.push(0, (j + 1) % pileus_cSegments + 1, j + 1);
for (var j = 0; j < pileus_cSegments; j ++) {
pileus_indices.push(i * pileus_cSegments + 1 + j,
(i + 1) * pileus_cSegments + 1 + (j + 1) % pileus_cSegments,
(i + 1) * pileus_cSegments + 1 + j);
pileus_indices.push(i * pileus_cSegments + 1 + j,
i * pileus_cSegments + 1 + (j + 1) % pileus_cSegments,
(i + 1) * pileus_cSegments + 1 + (j + 1) % pileus_cSegments);
}
}
// for (var i = 0; i < pileus_cSegments; i += 5) {
// for (var j = 0; j < pileus_rSegments - 1; j ++) {
// pileus_indices.push(0);
// pileus_indices.push(j * pileus_cSegments + i + 1);
// pileus_indices.push((j + 1) * pileus_cSegments + i + 1);
// }
// }
pileus.setAttribute('position', new THREE.BufferAttribute(new Float32Array(pileus_points), 3));
pileus.setAttribute('color', new THREE.Float32BufferAttribute(pileus_colors, 3));
pileus.setIndex(pileus_indices);
pileus.computeVertexNormals();
pileus.translate(position.x + pileus_position.x, position.y + pileus_position.y, position.z + pileus_position.z);
// SKIRT
var skirt = new THREE.BufferGeometry();
const skirt_rotation = stipe_shape.getTangentAt(skirt_height);
const skirt_position = stipe_shape.getPointAt(skirt_height);
var skirt_points = [ skirt_shape.getPoint(0).x, skirt_shape.getPoint(0).y, skirt_shape.getPoint(0).z ];
var skirt_points_v3 = [ skirt_shape.getPoint(0), ];
var skirt_indices = [];
var skirt_normals = [];
var skirt_colors = [0,0,0];
var skirt_rSegments = Math.max(Math.floor(20 * stipe_radius(0, skirt_height)), 5);
var skirt_cSegments = Math.max(Math.floor(40 * stipe_radius(0, skirt_height)), 5);
var skirt_rimSegments = 5;
var skirt_q = new THREE.Quaternion();
skirt_q.setFromUnitVectors( new THREE.Vector3( 0, 1, 0 ), skirt_rotation );
var skirt_rotation_offset_q = (new THREE.Quaternion()).setFromAxisAngle(skirt_rotation, skirt_rotation_offset);
var skirt_rim_da = new THREE.Quaternion();
skirt_rim_da.setFromAxisAngle ( new THREE.Vector3(0, 0, -1), Math.PI / skirt_rimSegments )
function skirt_surface(a, t, rim_it=0) {
var noisyt = t * (1 + skirt_radnoise(a, t));
if (noisyt > 1) noisyt = 1;
if (noisyt < 0) noisyt = 0;
var shape_point = skirt_shape.getPointAt(noisyt).multiplyScalar(skirt_scale);
// shape_point.add(new THREE.Vector3(stipe_radius(skirt_height),0,0));
var tangent = skirt_shape.getTangentAt(noisyt);
var noisev = new THREE.Vector3(0,0,0);
noisev.crossVectors(z1, tangent);
var rim_lv = tangent.multiplyScalar(skirt_thickness).multiplyScalar(rim_it / skirt_rimSegments);
if (rim_it == 0) rim_lv = new THREE.Vector3(0,0,0);
for (var k = 0; k < rim_it; k ++) rim_lv.applyQuaternion(skirt_rim_da);
var surface_point = new THREE.Vector3(0,0,0);
surface_point.x = Math.cos(a + skirt_angnoise(a, noisyt)) * (shape_point.x + rim_local_vector.x);
surface_point.y = shape_point.y + rim_local_vector.y;
surface_point.z = Math.sin(a + skirt_angnoise(a, noisyt)) * (shape_point.x + rim_local_vector.x);
// console.log(surface_point)
var surfnoise_val = skirt_surfnoise(a, noisyt);
surface_point.applyQuaternion(skirt_q);
surface_point.applyQuaternion(skirt_rotation_offset_q);
surface_point.x = surface_point.x + noisev.x * Math.cos(a) * surfnoise_val;
surface_point.y = surface_point.y + noisev.y * surfnoise_val;
surface_point.z = surface_point.z + noisev.x * Math.sin(a) * surfnoise_val;
return surface_point;
}
if (hasskirt) {
for (var i = 1; i <= skirt_rSegments; i++) {
var t = Math.pow(1 / skirt_rSegments * i, 0.9);
for (var j = 0; j < skirt_cSegments; j++) {
var a = Math.PI * 2 / skirt_cSegments * j;
var surface_point = skirt_surface(a, t);
skirt_points.push(surface_point.x, surface_point.y, surface_point.z);
skirt_points_v3.push(surface_point);
skirt_colors.push(...skirt_color(a, t));
}
}
for (var i = 1; i < skirt_rimSegments; i++) {
for (var j = 0; j < skirt_cSegments; j++) {
var a = Math.PI * 2 / skirt_cSegments * j;
var surface_point = skirt_surface(a, 1, i);
skirt_points.push(surface_point.x, surface_point.y, surface_point.z);
// skirt_points_v3.push(surface_point);
skirt_colors.push(...skirt_color(a, 1));
}
}
for (var i = 0; i < skirt_rSegments + skirt_rimSegments - 2; i ++) {
if (i == 0) for (var j = 0; j < skirt_cSegments; j ++) skirt_indices.push(0, (j + 1) % skirt_cSegments + 1, j + 1);
for (var j = 0; j < skirt_cSegments; j ++) {
skirt_indices.push(i * skirt_cSegments + 1 + j,
(i + 1) * skirt_cSegments + 1 + (j + 1) % skirt_cSegments,
(i + 1) * skirt_cSegments + 1 + j);
skirt_indices.push(i * skirt_cSegments + 1 + j,
i * skirt_cSegments + 1 + (j + 1) % skirt_cSegments,
(i + 1) * skirt_cSegments + 1 + (j + 1) % skirt_cSegments);
}
}
// skirt = new THREE.ConvexGeometry( skirt_points_v3 );
skirt.setAttribute('position', new THREE.BufferAttribute(new Float32Array(skirt_points), 3));
skirt.setAttribute('color', new THREE.Float32BufferAttribute(skirt_colors, 3));
skirt.setIndex(skirt_indices);
skirt.computeVertexNormals();
skirt.translate(position.x + skirt_position.x, position.y + skirt_position.y, position.z + skirt_position.z);
} else {
skirt.setAttribute('position', new THREE.BufferAttribute(new Float32Array(skirt_points), 3));
skirt.translate(position.x + skirt_position.x, position.y + skirt_position.y, position.z + skirt_position.z);
}
// DOTS
var dots = new THREE.BufferGeometry();
var bufgeoms = [];
for (var i = 0; i < dots_num; i++) {
var dots_points = [];
var a = rackrand() * Math.PI * 2;
var t = rackrand();
var dot_center = pileus_surface(a, t);
for (var j = 0; j < 35; j++) {
dots_points.push(new THREE.Vector3(
dot_center.x + (1 - rackrand() * 2) * dots_radius * pileus_scale,
dot_center.y + (1 - rackrand() * 2) * dots_radius * pileus_scale,
dot_center.z + (1 - rackrand() * 2) * dots_radius * pileus_scale));
}
var dots_geometry = new THREE.ConvexGeometry( dots_points );
// var dots_mesh = new THREE.Mesh(dots_geometry);
// dots_mesh.updateMatrix();
bufgeoms.push(dots_geometry);
}
if (bufgeoms.length > 0) dots = THREE.BufferGeometryUtils.mergeBufferGeometries(bufgeoms);
dots.translate(position.x + pileus_position.x, position.y + pileus_position.y, position.z + pileus_position.z);
// PLATES
var plates_points = [];
var plates_indices = [];
var indices_offset=0;
var plates_normals = [];
var plates_colors = [];
var plate_shape;
var plates = new THREE.BufferGeometry();
const y1 = new THREE.Vector3(0,1,0);
var plate_offset = new THREE.Vector3(0,0,0);
function get_plate_shape(a, t, c=1) {
var plate_shape_0 = stipe_shape.getPointAt(plates_height + (1 - plates_height) * (1 - t)).sub(stipe_shape.getPointAt(1));
var plate_shape_1 = pileus_surface(a, 0.9).add(stipe_shape.getTangent(1).multiplyScalar(-0.5 * pileus_scale));
var plate_shape_points = [plate_shape_0];
const points_num = 15;
for (var m = 0; m < points_num; m ++) {
var d = m / points_num;
var surf_m = pileus_surface(a, d * 0.9).add(stipe_shape.getTangent(1).multiplyScalar(-0.5 * pileus_scale));
var plate_base_m = plate_shape_0.clone().add(plate_shape_1.clone().sub(plate_shape_0.clone()).multiplyScalar(d));
var plate_shape_m = plate_base_m.sub(surf_m);
if (plate_shape_m.y > 0) plate_shape_m.multiplyScalar(-1);
plate_shape_points.push(surf_m.add(plate_shape_m.normalize().multiplyScalar(c)));
}
plate_shape_points.push(plate_shape_1);
var plate_shape = new THREE.CatmullRomCurve3( plate_shape_points, closed=false, curveType='catmullrom', tension=0.5);
return plate_shape;
}
const divider = 10;
for (var i = 0; i < plates_num; i++) {
indices_offset = Math.floor(plates_points.length / 3);
var a = 2 * Math.PI / plates_num * i;
plate_shape = get_plate_shape(a, 0.9, 1);
var plate_point;
for (var j = 0; j < plates_resolution; j ++) {
plate_point = plate_shape.getPointAt(j / plates_resolution);
plates_points.push(plate_point.x, plate_point.y, plate_point.z);
plates_colors.push(...plates_color(a, j / plates_resolution));
}
for (var k = 1; k < plates_resolution / divider; k ++) {
plate_shape = get_plate_shape(a, (1 - k / plates_resolution * divider / 2) * 0.9, 1 - k / plates_resolution * divider);
for (var j = 0; j < plates_resolution; j ++) {
plate_point = plate_shape.getPointAt(j / plates_resolution);
tangent = plate_shape.getTangentAt(j / plates_resolution);
plate_offset.crossVectors(y1, tangent).normalize().multiplyScalar(0.1);
var plate_surfnoise = new THREE.Vector3(0,0,0);
plate_surfnoise.crossVectors(y1, tangent).normalize().multiplyScalar(plates_surfnoise(2 * Math.PI / plates_num * i, j / plates_resolution));
plates_points.push(plate_point.x + plate_surfnoise.x + plate_offset.x, plate_point.y + plate_surfnoise.y + plate_offset.y, plate_point.z + plate_surfnoise.z + plate_offset.z);
plates_points.push(plate_point.x + plate_surfnoise.x - plate_offset.x, plate_point.y + plate_surfnoise.y - plate_offset.y, plate_point.z + plate_surfnoise.z - plate_offset.z);
plates_colors.push(...plates_color(a, j / plates_resolution));
plates_colors.push(...plates_color(a, j / plates_resolution));
}
}
for (var j = 0; j < plates_resolution - 1; j ++) {
plates_indices.push(indices_offset + j, indices_offset + plates_resolution + j*2, indices_offset + j + 1);
plates_indices.push(indices_offset + j + 1, indices_offset + plates_resolution + j*2, indices_offset + plates_resolution + j*2 + 2);
plates_indices.push(indices_offset + j, indices_offset + j + 1, indices_offset + plates_resolution + j*2 + 1);
plates_indices.push(indices_offset + j + 1, indices_offset + plates_resolution + j*2 + 3, indices_offset + plates_resolution + j*2 + 1);
}
for (var k = 0; k < plates_resolution / divider - 2; k ++) {
for (var j = 0; j < plates_resolution - 1; j ++) {
var local_offset = (k * 2 + 1) * plates_resolution + indices_offset;
plates_indices.push(local_offset + j*2, local_offset + plates_resolution*2 + j*2, local_offset + (j+1)*2);
plates_indices.push(local_offset + (j+1)*2, local_offset + plates_resolution*2 + j*2, local_offset + plates_resolution*2 + (j+1)*2);
plates_indices.push(local_offset + j*2 + 1, local_offset + (j+1)*2 + 1, local_offset + plates_resolution*2 + j*2 + 1);
plates_indices.push(local_offset + (j+1)*2 + 1, local_offset + plates_resolution*2 + (j+1)*2 + 1, local_offset + plates_resolution*2 + j*2 + 1);
}
}
}
for (var i = 0; i < plates_num - 1; i++) {
var local_offset_1 = i * (2 * (plates_resolution / divider - 1) + 1) * plates_resolution + (2 * (plates_resolution / divider - 2) + 1) * plates_resolution;
var local_offset_2 = ((i + 1) % plates_num) * (2 * (plates_resolution / divider - 1) + 1) * plates_resolution + (2 * (plates_resolution / divider - 2) + 1) * plates_resolution;
for (var j = 0; j < plates_resolution - 1; j ++) {
plates_indices.push(local_offset_1 + j*2 + 1, local_offset_1 + j*2 + 3, local_offset_2 + j*2);
plates_indices.push(local_offset_1 + j*2 + 3, local_offset_2 + j*2 + 3, local_offset_2 + j*2);
}
}
plates.setAttribute('position', new THREE.BufferAttribute(new Float32Array(plates_points), 3));
plates.setAttribute('color', new THREE.Float32BufferAttribute(plates_colors, 3));
plates.setIndex(plates_indices);
plates.computeVertexNormals();
plates.translate(position.x + pileus_position.x, position.y + pileus_position.y, position.z + pileus_position.z);
if (convex) {
var stipe_points_vector3 = [];
for (var i = 0; i < stipe_points.length; i += 3) stipe_points_vector3.push(new THREE.Vector3(stipe_points[i], stipe_points[i+1], stipe_points[i+2]));
const stipe_geometry = new THREE.ConvexGeometry( stipe_points_vector3 );
stipe_geometry.translate(position.x, position.y, position.z)
var pileus_points_vector3 = [];
for (var i = 0; i < pileus_points.length; i += 3) pileus_points_vector3.push(new THREE.Vector3(pileus_points[i], pileus_points[i+1], pileus_points[i+2]));
const pileus_geometry = new THREE.ConvexGeometry( pileus_points_vector3 );
pileus_geometry.translate(position.x + pileus_position.x, position.y + pileus_position.y, position.z + pileus_position.z);
var plates_points_vector3 = [];
for (var i = 0; i < plates_points.length; i += 3) plates_points_vector3.push(new THREE.Vector3(plates_points[i], plates_points[i+1], plates_points[i+2]));
const plates_geometry = new THREE.ConvexGeometry( plates_points_vector3 );
plates_geometry.translate(position.x + pileus_position.x, position.y + pileus_position.y, position.z + pileus_position.z);
return [stipe_geometry, pileus_geometry, plates_geometry, dots, skirt];
}
return [stipe, pileus, plates, dots, skirt];
}
function grass(position, size, color) {
var grass = new THREE.BufferGeometry();
var grass_res = 5;
var grass_spline = new THREE.CatmullRomCurve3( [
new THREE.Vector3( 0, 0, 0 ),
new THREE.Vector3( rnd(-0.5, 0.5) * size, 2 * size, 0 ),
new THREE.Vector3( rnd(-1, 1) * size, 4 * size, 0 ),
], closed=false )
var grass_points = [];
var grass_indices = [];
var z1 = new THREE.Vector3(0,0,1);
var orth = new THREE.Vector3(0,0,0);
for (var i = 0; i < grass_res; i++) {
var t = i / grass_res;
var bpoint = grass_spline.getPointAt(t);
var tangent = grass_spline.getTangentAt(t);
orth.crossVectors(z1, tangent);
grass_points.push(bpoint.x, bpoint.y, bpoint.z);
var left = orth.clone().normalize().multiplyScalar(-0.2 * (1 - t + 0.01)**2);
var right = orth.clone().normalize().multiplyScalar(0.2 * (1 - t + 0.01)**2);
grass_points.push(bpoint.x + left.x, bpoint.y + left.y, bpoint.z + left.z);
grass_points.push(bpoint.x + right.x, bpoint.y + right.y, bpoint.z + right.z);
grass_points.push(bpoint.x, bpoint.y, bpoint.z - 0.1);
}
for (var i = 0; i < grass_res - 1; i ++) {
grass_indices.push(i * 4, (i + 1) * 4 + 1, (i + 1) * 4);
grass_indices.push(i * 4, i * 4 + 1, (i + 1) * 4 + 1);
grass_indices.push(i * 4, (i + 1) * 4 + 2, i * 4 + 2);
grass_indices.push(i * 4, (i + 1) * 4, (i + 1) * 4 + 2);
grass_indices.push(i * 4 + 1, i * 4 + 3, (i + 1) * 4 + 3);
grass_indices.push(i * 4 + 1, (i + 1) * 4 + 3, (i + 1) * 4 + 1);
grass_indices.push(i * 4 + 2, (i + 1) * 4 + 3, i * 4 + 3);
grass_indices.push(i * 4 + 2, (i + 1) * 4 + 2, (i + 1) * 4 + 3);
}
grass.setAttribute('position', new THREE.BufferAttribute(new Float32Array(grass_points), 3));
// grass.setAttribute('color', new THREE.Float32BufferAttribute(skirt_colors, 3));
grass.setIndex(grass_indices);
grass.computeVertexNormals();
grass.translate(position.x, position.y, position.z);
return grass;
}