three.js貼圖

時間 2019-11-10

原文原文鏈接

使用圖像做爲材質。這時候，就須要導入圖像做爲紋理貼圖，並添加到相應的材質中javascript

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
    <head>
        <script type="text/javascript" src="libs/three.js"></script>
        
        <script type="text/javascript">
            function init() {
                var renderer = new THREE.WebGLRenderer({
                    canvas: document.getElementById('mainCanvas')
                });
                renderer.setClearColor(0x000000);
                var scene = new THREE.Scene();
                
                // camera
                var camera = new THREE.OrthographicCamera(-10, 10, 7.5, -7.5, 0.1, 100);
                camera.position.set(25, 25, 25);
                camera.lookAt(new THREE.Vector3(0, 0, 0));
                scene.add(camera);
                
                // light
                var light = new THREE.PointLight(0xffffff, 1, 1000);
                light.position.set(10, 15, 20);
                scene.add(light);
                //若是沒有重繪函數，就須要在完成導入紋理的步驟後，從新繪製畫面，這是在回調函數中實現
                var texture = THREE.ImageUtils.loadTexture('img/0.png', {}, function() {//將圖片導入到紋理中
                    renderer.render(scene, camera);
                });
                var material = new THREE.MeshLambertMaterial({//將材質的map屬性設置爲texture：
                    map: texture
                });
                
                var cube = new THREE.Mesh(new THREE.CubeGeometry(5, 5, 5), material);
                scene.add(cube);
                //var sphere = new THREE.Mesh(new THREE.SphereGeometry(5, 25, 15), material);
                //scene.add(sphere);
                
                renderer.render(scene, camera);
            }
        </script>
    </head>
    
    <body onload="init()">
        <canvas id="mainCanvas" width="400px" height="300px" ></canvas>
    </body>
</html>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
    <head>
        <script type="text/javascript" src="libs/three.js"></script>
        
        <script type="text/javascript">
            function init() {
                var renderer = new THREE.WebGLRenderer({
                    canvas: document.getElementById('mainCanvas')
                });
                renderer.setClearColor(0x000000);
                var scene = new THREE.Scene();
                
                // camera
                var camera = new THREE.OrthographicCamera(-10, 10, 7.5, -7.5, 0.1, 100);
                camera.position.set(25, 25, 25);
                camera.lookAt(new THREE.Vector3(0, 0, 0));
                scene.add(camera);
                
                // light
                var light = new THREE.PointLight(0xffffff, 1, 1000);
                light.position.set(10, 15, 20);
                scene.add(light);
                
                var materials = [];
                for (var i = 0; i < 6; ++i) {//導入圖像到六個紋理，並設置到六個材質中
                    materials.push(new THREE.MeshBasicMaterial({
                        map: THREE.ImageUtils.loadTexture('img/' + i + '.png', {}, function() {
                            renderer.render(scene, camera);
                        }),
                        overdraw: true
                    }));
                }
                
                var cube = new THREE.Mesh(new THREE.CubeGeometry(5, 5, 5),
                        new THREE.MeshFaceMaterial(materials));
                scene.add(cube);
                
                renderer.render(scene, camera);
            }
        </script>
    </head>
    
    <body onload="init()">
        <canvas id="mainCanvas" width="400px" height="300px" ></canvas>
    </body>
</html>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
    <head>
        <script type="text/javascript" src="libs/three.js"></script>
        
        <script type="text/javascript">
            function init() {
                var renderer = new THREE.WebGLRenderer({
                    canvas: document.getElementById('mainCanvas')
                });
                //renderer.setClearColor(0x666666);
                var scene = new THREE.Scene();
                
                // camera
                var camera = new THREE.OrthographicCamera(-10, 10, 7.5, -7.5, 0.1, 100);
                camera.position.set(0, 0, 25);
                camera.lookAt(new THREE.Vector3(0, 0, 0));
                scene.add(camera);
                
                // light
                var light = new THREE.PointLight(0xffffff, 1, 1000);
                light.position.set(10, 15, 20);
                scene.add(light);
                
                var texture = THREE.ImageUtils.loadTexture('img/chess.png', {}, function() {
                    renderer.render(scene, camera);
                });
                texture.wrapS = texture.wrapT = THREE.RepeatWrapping;//指定重複方式爲兩個方向（wrapS和wrapT）都重複
                texture.repeat.set(4, 4);//，設置兩個方向上都重複4次，因爲咱們的圖像原本是有2行2列，因此重複4次即爲8行8列
                var material = new THREE.MeshLambertMaterial({
                    map: texture
                });
                
                var plane = new THREE.Mesh(new THREE.PlaneGeometry(12, 12), material);
                scene.add(plane);
                
                renderer.render(scene, camera);
            }
        </script>
    </head>
    
    <body onload="init()">
        <canvas id="mainCanvas" width="400px" height="300px" ></canvas>
    </body>
</html>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
    <head>
        <script type="text/javascript" src="libs/three.js"></script>
        
        <script type="text/javascript">
            function init() {
                var renderer = new THREE.WebGLRenderer({
                    canvas: document.getElementById('mainCanvas')
                });
                renderer.setClearColor(0x000000);
                var scene = new THREE.Scene();
                
                // camera
                var camera = new THREE.OrthographicCamera(-2.5, 2.5, 1.875, -1.875, 0.1, 100);
                camera.position.set(5, 5, 20);
                camera.lookAt(new THREE.Vector3(0, 0, 0));
                scene.add(camera);
                
                var material = new THREE.MeshLambertMaterial({
                    color: 0xffff00
                });
                var geometry = new THREE.CubeGeometry(1, 2, 3);
                var mesh = new THREE.Mesh(geometry, material);//把幾何形狀與材質傳入其構造函數
                scene.add(mesh);
                
                var light = new THREE.DirectionalLight(0xffffff);
                light.position.set(20, 10, 5);
                scene.add(light);
                
                // render
                renderer.render(scene, camera);
            }
        </script>
    </head>
    
    <body onload="init()">
        <canvas id="mainCanvas" width="400px" height="300px" ></canvas>
    </body>
</html>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
    <head>
        <script type="text/javascript" src="libs/three.js"></script>
        
        <script type="text/javascript">
            function init() {
                var renderer = new THREE.WebGLRenderer({
                    canvas: document.getElementById('mainCanvas')
                });
                renderer.setClearColor(0x000000);
                var scene = new THREE.Scene();
                
                // camera
                var camera = new THREE.OrthographicCamera(-2.5, 2.5, 1.875, -1.875, 0.1, 100);
                camera.position.set(5, 5, 20);
                camera.lookAt(new THREE.Vector3(0, 0, 0));
                scene.add(camera);
                
                var material = new THREE.MeshLambertMaterial({
                    color: 0xffff00
                });
                var geometry = new THREE.CubeGeometry(1, 2, 3);
                var mesh = new THREE.Mesh(geometry, material);
                scene.add(mesh);
                
                mesh.material = new THREE.MeshLambertMaterial({
                    color: 0xff0000
                });
                
                var light = new THREE.DirectionalLight(0xffffff);
                light.position.set(20, 10, 5);
                scene.add(light);
                
                // render
                renderer.render(scene, camera);
            }
        </script>
    </head>
    
    <body onload="init()">
        <canvas id="mainCanvas" width="400px" height="300px" ></canvas>
    </body>
</html>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
    <head>
        <script type="text/javascript" src="libs/three.js"></script>
        
        <script type="text/javascript">
            function init() {
                var renderer = new THREE.WebGLRenderer({
                    canvas: document.getElementById('mainCanvas')
                });
                renderer.setClearColor(0x000000);
                var scene = new THREE.Scene();
                
                // camera
                var camera = new THREE.OrthographicCamera(-2.5, 2.5, 1.875, -1.875, 0.1, 100);
                camera.position.set(5, 5, 20);
                camera.lookAt(new THREE.Vector3(0, 0, 0));
                scene.add(camera);
                
                var material = new THREE.MeshLambertMaterial({
                    color: 0xffff00
                });
                var geometry = new THREE.CubeGeometry(1, 2, 3);
                var mesh = new THREE.Mesh(geometry, material);
                scene.add(mesh);
                
                mesh.position.set(1.5, -0.5, 0);
                mesh.position = new THREE.Vector3(1.5, -0.5, 0);
                mesh.position.z = 1;//只設置其中一個屬性
                //若是須要同時設置多個屬性，能夠使用如下兩種方法： mesh.position.set(1.5, -0.5, 0);
                
                var light = new THREE.DirectionalLight(0xffffff);
                light.position.set(20, 10, 5);
                scene.add(light);
                
                drawAxes(scene);
                
                // render
                renderer.render(scene, camera);
            }
            
            function drawAxes(scene) {
                // x-axis
                var xGeo = new THREE.Geometry();
                xGeo.vertices.push(new THREE.Vector3(0, 0, 0));
                xGeo.vertices.push(new THREE.Vector3(1, 0, 0));
                var xMat = new THREE.LineBasicMaterial({
                    color: 0xff0000
                });
                var xAxis = new THREE.Line(xGeo, xMat);
                scene.add(xAxis);
                
                // y-axis
                var yGeo = new THREE.Geometry();
                yGeo.vertices.push(new THREE.Vector3(0, 0, 0));
                yGeo.vertices.push(new THREE.Vector3(0, 1, 0));
                var yMat = new THREE.LineBasicMaterial({
                    color: 0x00ff00
                });
                var yAxis = new THREE.Line(yGeo, yMat);
                scene.add(yAxis);
                
                // z-axis
                var zGeo = new THREE.Geometry();
                zGeo.vertices.push(new THREE.Vector3(0, 0, 0));
                zGeo.vertices.push(new THREE.Vector3(0, 0, 1));
                var zMat = new THREE.LineBasicMaterial({
                    color: 0x00ccff
                });
                var zAxis = new THREE.Line(zGeo, zMat);
                scene.add(zAxis);
            }
        </script>
    </head>
    
    <body onload="init()">
        <canvas id="mainCanvas" width="400px" height="300px" ></canvas>
    </body>
</html>

縮放對應的屬性是scale，旋轉對應的屬性是rotation，具體方法與上例相同html

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