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// transform.js function rotate_x(center, sin_cos_angle, point) { var diff1 = point[1] - center[1]; var diff2 = center[2] - point[2]; point[1] = center[1] + diff1 * sin_cos_angle[1] + diff2 * sin_cos_angle[0]; point[2] = center[2] - diff2 * sin_cos_angle[1] + diff1 * sin_cos_angle[0]; } function rotate_x_normal(sin_cos_angle, point) { var temp = point[1]; point[1] = temp * sin_cos_angle[1] - point[2] * sin_cos_angle[0]; point[2] = point[2] * sin_cos_angle[1] + temp * sin_cos_angle[0]; } function rotate_y(center, sin_cos_angle, point) { var diff1 = point[0] - center[0]; var diff2 = point[2] - center[2]; point[0] = center[0] + diff1 * sin_cos_angle[1] + diff2 * sin_cos_angle[0]; point[2] = center[2] + diff2 * sin_cos_angle[1] - diff1 * sin_cos_angle[0]; } function rotate_y_normal(sin_cos_angle, point) { var temp = point[0]; point[0] = temp * sin_cos_angle[1] + point[2] * sin_cos_angle[0]; point[2] = point[2] * sin_cos_angle[1] - temp * sin_cos_angle[0]; } function rotate_z(center, sin_cos_angle, point) { var diff1 = point[0] - center[0]; var diff2 = point[1] - center[1]; point[0] = center[0] + diff1 * sin_cos_angle[1] - diff2 * sin_cos_angle[0]; point[1] = center[1] + diff2 * sin_cos_angle[1] + diff1 * sin_cos_angle[0]; } function rotate_z_normal(sin_cos_angle, point) { var temp = point[0]; point[0] = temp * sin_cos_angle[1] - point[1] * sin_cos_angle[0]; point[1] = point[1] * sin_cos_angle[1] + temp * sin_cos_angle[0]; } function get_rotation_parameter(center, vector, teta) { var result = new Array(); var u_u = vector[0] * vector[0]; var v_v = vector[1] * vector[1]; var w_w = vector[2] * vector[2]; var v_v_p_w_w = (v_v + w_w); var u_u_p_w_w = (u_u + w_w); var u_u_p_v_v = (u_u + v_v); var b_v_p_c_w = center[1] * vector[1] + center[2] * vector[2]; var a_u_p_c_w = center[0] * vector[0] + center[2] * vector[2]; var a_u_p_b_v = center[0] * vector[0] + center[1] * vector[1]; var b_w_m_c_v = center[1] * vector[2] - center[2] * vector[1]; var c_u_m_a_w = center[2] * vector[0] - center[0] * vector[2]; var a_v_m_b_u = center[0] * vector[1] - center[1] * vector[0]; var den = v_v + u_u + w_w; result[0] = den; result[1] = v_v_p_w_w; result[2] = u_u_p_w_w; result[3] = u_u_p_v_v; result[4] = center[0] * v_v_p_w_w; result[5] = center[1] * u_u_p_w_w; result[6] = center[2] * u_u_p_v_v; result[7] = b_v_p_c_w; result[8] = a_u_p_c_w; result[9] = a_u_p_b_v; result[10] = Math.cos(teta); result[11] = Math.sin(teta) * Math.sqrt(den); result[12] = b_w_m_c_v; result[13] = c_u_m_a_w; result[14] = a_v_m_b_u; result[15] = center[0]; result[16] = center[1]; result[17] = center[2]; result[18] = vector[0]; result[19] = vector[1]; result[20] = vector[2]; return result; } function rotate(p, point) { var p_20_p_2 = p[20] * point[2]; var p_19_p_1 = p[19] * point[1]; var p_18_p_0 = p[18] * point[0]; var u_x_p_v_y_p_w_z = p_18_p_0 + p_19_p_1 + p_20_p_2; var temp0 = point[0]; var temp1 = point[1]; point[0] = (p[4] + p[18] * (-p[7] + u_x_p_v_y_p_w_z) + ((temp0 - p[15]) * p[1] + p[18] * (p[7] - p_19_p_1 - p_20_p_2)) * p[10] + p[11] * (p[12] - p[20] * temp1 + p[19] * point[2])) / p[0]; point[1] = (p[5] + p[19] * (-p[8] + u_x_p_v_y_p_w_z) + ((temp1 - p[16]) * p[2] + p[19] * (p[8] - p_18_p_0 - p_20_p_2)) * p[10] + p[11] * (p[13] + p[20] * temp0 - p[18] * point[2])) / p[0]; point[2] = (p[6] + p[20] * (-p[9] + u_x_p_v_y_p_w_z) + ((point[2] - p[17]) * p[3] + p[20] * (p[9] - p_18_p_0 - p_19_p_1)) * p[10] + p[11] * (p[14] - p[19] * temp0 + p[18] * temp1)) / p[0]; } function translate(vector, point) { point[0] = point[0] + vector[0]; point[1] = point[1] + vector[1]; point[2] = point[2] + vector[2]; } function scale(vector, point) { point[0] = point[0] * vector[0]; point[1] = point[1] * vector[1]; point[2] = point[2] * vector[2]; } function translate_solid(vector, solid) { translate(vector, solid.center); for (var i = 0; i < solid.points_number; i++) { translate(vector, solid.points[i]); } } function translate_solid_direction(vector, delta, solid) { translate([vector[0] * delta, vector[1] * delta, vector[2] * delta], solid.center); for (var i = 0; i < solid.points_number; i++) { translate([vector[0] * delta, vector[1] * delta, vector[2] * delta], solid.points[i]); } } function scale_solid(vector, solid) { var da = solid.center; var a = [-solid.center[0], -solid.center[1], -solid.center[2]]; translate_solid(a, solid); for (var i = 0; i < solid.points_number; i++) { scale(vector, solid.points[i]); } translate_solid(da, solid); } function rotate_solid(point, vector, angle, solid) { parametri = get_rotation_parameter(point, vector, angle); parametri2 = get_rotation_parameter([0, 0, 0], vector, angle); rotate(parametri, solid.center); rotate(parametri2, solid.axis_x); rotate(parametri2, solid.axis_y); rotate(parametri2, solid.axis_z); for (var i = 0; i < solid.faces_number; i++) { rotate(parametri2, solid.normals[i]); } for (var j = 0; j < solid.points_number; j++) { rotate(parametri, solid.points[j]); } } function rotate_solid_fast(parametri1, parametri2, solid) { rotate(parametri1, solid.center); rotate(parametri2, solid.axis_x); rotate(parametri2, solid.axis_y); rotate(parametri2, solid.axis_z); for (var i = 0; i < solid.faces_number; i++) { rotate(parametri2, solid.normals[i]); } for (var j = 0; j < solid.points_number; j++) { rotate(parametri1, solid.points[j]); } } function rotate_solid_x(center, angle, solid) { var sin_cosin_teta = [Math.sin(angle), Math.cos(angle)]; rotate_x(center, sin_cosin_teta, solid.center); rotate_x_normal(sin_cosin_teta, solid.axis_x); rotate_x_normal(sin_cosin_teta, solid.axis_y); rotate_x_normal(sin_cosin_teta, solid.axis_z); for (var i = 0; i < solid.faces_number; i++) { rotate_x_normal(sin_cosin_teta, solid.normals[i]); } for (var j = 0; j < solid.points_number; j++) { rotate_x(center, sin_cosin_teta, solid.points[j]); } } function rotate_solid_y(center, angle, solid) { var sin_cosin_teta = [Math.sin(angle), Math.cos(angle)]; rotate_y(center, sin_cosin_teta, solid.center); rotate_y_normal(sin_cosin_teta, solid.axis_x); rotate_y_normal(sin_cosin_teta, solid.axis_y); rotate_y_normal(sin_cosin_teta, solid.axis_z); for (var i = 0; i < solid.faces_number; i++) { rotate_y_normal(sin_cosin_teta, solid.normals[i]); } for (var j = 0; j < solid.points_number; j++) { rotate_y(center, sin_cosin_teta, solid.points[j]); } } function rotate_solid_z(center, angle, solid) { var sin_cosin_teta = [Math.sin(angle), Math.cos(angle)]; rotate_z(center, sin_cosin_teta, solid.center); rotate_z_normal(sin_cosin_teta, solid.axis_x); rotate_z_normal(sin_cosin_teta, solid.axis_y); rotate_z_normal(sin_cosin_teta, solid.axis_z); for (var i = 0; i < solid.faces_number; i++) { rotate_z_normal(sin_cosin_teta, solid.normals[i]); } for (var j = 0; j < solid.points_number; j++) { rotate_z(center, sin_cosin_teta, solid.points[j]); } } function project(distance, point) { var result = new Array(); result[0] = point[0] * distance / point[2] + 500; result[1] = 275 - point[1] * distance / point[2]; result[2] = distance; return result; } // inline function scene() { this.solid_number = 0; this.solid = new Array(); this.observer = [0, 0, 0]; this.distance = -650; } var world = new scene(); var colore = 'rgb(255,255,255)'; var alpha = 0.6; var teta_x_global = 0; var teta_y_global = 0; var motion = 1; var id_timer = 0; function init() { world.solid[world.solid_number++] = new dinosaur([255, 255, 255], [0, 0, 0]); scale_solid([3, 3, 3], world.solid[world.solid_number - 1]); translate_solid([-world.solid[world.solid_number - 1].center[0], -world.solid[world.solid_number - 1].center[1], -world.solid[world.solid_number - 1].center[2]], world.solid[world.solid_number - 1]); translate_solid([0, 0, -1100], world.solid[world.solid_number - 1]); document.onkeydown = onKeyDown; document.onmousemove = onMouseMove; setInterval(draw, 10); } function changeModel() { clearInterval(id_timer); var canvas = document.getElementById("display"); if (canvas.getContext) { var ctx = canvas.getContext("2d"); ctx.clearRect(0, 0, 1000, 550); } if (document.getElementById("modello").value == 'dino') { world.solid[0] = new dinosaur([255, 255, 255], [0, 0, 0]); scale_solid([3, 3, 3], world.solid[world.solid_number - 1]); translate_solid([-world.solid[world.solid_number - 1].center[0], -world.solid[world.solid_number - 1].center[1], -world.solid[world.solid_number - 1].center[2]], world.solid[world.solid_number - 1]); translate_solid([0, 0, -1100], world.solid[world.solid_number - 1]); } if (document.getElementById("modello").value == 'heli') { world.solid[0] = new helicopter([255, 255, 255], [0, 0, 0]); scale_solid([12, 12, 12], world.solid[world.solid_number - 1]); translate_solid([-world.solid[world.solid_number - 1].center[0], -world.solid[world.solid_number - 1].center[1], -world.solid[world.solid_number - 1].center[2]], world.solid[world.solid_number - 1]); translate_solid([0, 0, -1100], world.solid[world.solid_number - 1]); } if (document.getElementById("modello").value == 'ship') { world.solid[0] = new ship([255, 255, 255], [0, 0, 0]); scale_solid([3, 3, 3], world.solid[world.solid_number - 1]); translate_solid([-world.solid[world.solid_number - 1].center[0], -world.solid[world.solid_number - 1].center[1], -world.solid[world.solid_number - 1].center[2]], world.solid[world.solid_number - 1]); translate_solid([0, 0, -1100], world.solid[world.solid_number - 1]); } id_timer = setInterval(draw, 10); } function onKeyDown(evt) { if (evt.keyCode == 77) motion = (motion + 1) % 2; if (evt.keyCode == 82) colore = 'rgb(255,0,0)'; if (evt.keyCode == 71) colore = 'rgb(0,255,0)'; if (evt.keyCode == 89) colore = 'rgb(255,255,0)'; if (evt.keyCode == 66) colore = 'rgb(0,0,255)'; if (evt.keyCode == 87) colore = 'rgb(255,255,255)'; if (evt.keyCode == 49) alpha = 0.1; if (evt.keyCode == 50) alpha = 0.15; if (evt.keyCode == 51) alpha = 0.2; if (evt.keyCode == 52) alpha = 0.25; if (evt.keyCode == 53) alpha = 0.3; if (evt.keyCode == 54) alpha = 0.4; if (evt.keyCode == 55) alpha = 0.5; if (evt.keyCode == 56) alpha = 0.6; if (evt.keyCode == 57) alpha = 0.7; if (evt.keyCode == 48) alpha = 0.8; } function onMouseMove(evt) { var x = evt.pageX - document.getElementById("display").offsetLeft; var y = evt.pageY - document.getElementById("display").offsetTop; if ((x > 0) && (x < 1000) && (y > 0) && (y < 550)) { teta_y_global = 0.10 * (x - 500) / 500; teta_x_global = 0.10 * (y - 275) / 275; } } function draw() { var canvas = document.getElementById("display"); if (canvas.getContext) { var ctx = canvas.getContext("2d"); if (motion == 0) { ctx.clearRect(0, 0, 1000, 550); } else { ctx.globalAlpha = 0.2; ctx.fillStyle = 'rgb(255,255,255)'; ctx.fillRect(0, 0, 1000, 550); } ctx.fillStyle = colore; ctx.strokeStyle = 'rgb(0,0,0)'; ctx.lineWidth = 0.5; ctx.globalAlpha = alpha; var parametrig1 = get_rotation_parameter([0, 0, -1100], [0, 1, 0], teta_y_global); var parametrig2 = get_rotation_parameter([0, 0, 0], [0, 1, 0], teta_y_global); var parametrig1a = get_rotation_parameter([0, 0, -1100], [1, 0, 0], teta_x_global); var parametrig2a = get_rotation_parameter([0, 0, 0], [1, 0, 0], teta_x_global); for (var i = 0; i < world.solid_number; i++) { rotate_solid_fast(parametrig1, parametrig2, world.solid[i]); rotate_solid_fast(parametrig1a, parametrig2a, world.solid[i]); } var contatore = 0; visible_polygons = new Array(); var delta_x; var delta_y; var delta_z; for (var j = 0; j < world.solid_number; j++) { for (var i = 0; i < world.solid[j].points_number; i++) { world.solid[j].distances[i] = Math.pow(world.solid[j].points[i][0], 2) + Math.pow(world.solid[j].points[i][1], 2) + Math.pow(world.solid[j].points[i][2], 2); } } for (var j = 0; j < world.solid_number; j++) { for (var i = 0; i < world.solid[j].faces_number; i++) { var max = world.solid[j].distances[world.solid[j].faces[i][0]]; for (var w = 1; w < world.solid[j].faces[i].length; w++) { if (world.solid[j].distances[world.solid[j].faces[i][w]] > max) max = world.solid[j].distances[world.solid[j].faces[i][w]]; } visible_polygons[contatore++] = { solid: j, vertex: world.solid[j].faces[i], fillcolor: world.solid[j].fillcolor, linecolor: world.solid[j].linecolor, distance: max }; } } visible_polygons.sort(sortfunction); var projected_points = new Array(); for (var j = 0; j < world.solid_number; j++) { projected_points[j] = new Array(); for (var i = 0; i < world.solid[j].points.length; i++) { projected_points[j][i] = project(world.distance, world.solid[j].points[i]); } } for (var i = 0; i < contatore; i++) { ctx.beginPath(); var indice_solido = visible_polygons[i].solid; var indici_vertici = visible_polygons[i].vertex; ctx.moveTo(projected_points[indice_solido][indici_vertici[0]][0], projected_points[indice_solido][indici_vertici[0]][1]); for (var z = 1; z < visible_polygons[i].vertex.length; z++) ctx.lineTo(projected_points[indice_solido][indici_vertici[z]][0], projected_points[indice_solido][indici_vertici[z]][1]); ctx.closePath(); ctx.fill(); ctx.stroke(); } } } function sortfunction(a, b) { return (b.distance - a.distance); }
Javascript 3D Model Viewer
Model:
Dinosaur
Ship
Helicopter
|
Color-keys:
r
-
y
-
g
-
w
-
b
|
Transparency-keys: 0-9
|
Motion-blur effect key: m
Use mouse to rotate 3D view. (Doesn't work in IE)
body { background-color:#000; padding:5px 0px; margin:0px; } .container { font-size: 12px; font-family:Verdana; text-align: center; position: relative; width:100%; color: #fff } .w { background-image: url(/assets/w.png); background-repeat: repeat-x; } .o { width:100%; background-position: bottom left; margin:5px 0px 5px 0px; } .i { background-position: top left; padding: 16px 0px; } .c { background-color: #fff; }
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