颜色叠加 [英] Superimposing of color
本文介绍了颜色叠加的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想用鼠标将立方体涂成红色.但因此绿色立方体(左侧)不是红色而是黑色.白色立方体(右侧)正常着色.该怎么办?示例 此处
I want to paint cubes red color by means of a mouse. But thus the green cube (at the left) becomes not red, but black. The white cube (on the right) is colored normally. What to do? example here
// init
var material = new THREE.MeshLambertMaterial({
color: 0x00ff00,
side: THREE.DoubleSide,
vertexColors: THREE.FaceColors
});
var geometry = new THREE.BoxGeometry(100, 100, 100, 4, 4, 4);
var Cube = new THREE.Mesh(geometry, material);
Cube.position.x = -100;
scene.add(Cube);
objects.push(Cube);
var material = new THREE.MeshLambertMaterial({
color: 0xffffff,
side: THREE.DoubleSide,
vertexColors: THREE.FaceColors
});
var geometry = new THREE.BoxGeometry(100, 100, 100, 4, 4, 4);
var Cube = new THREE.Mesh(geometry, material);
Cube.position.x = 100;
scene.add(Cube);
objects.push(Cube);
document.addEventListener('mousedown', onDocumentMouseDown, false);
//
function onDocumentMouseDown(event) {
var vector = new THREE.Vector3(
(event.clientX / window.innerWidth) * 2 - 1, -(event.clientY / window.innerHeight) * 2 + 1, 0.5);
vector.unproject(camera);
raycaster.set(camera.position, vector.sub(camera.position).normalize());
var intersects = raycaster.intersectObjects(objects);
if (intersects.length > 0) {
var index = intersects[0].faceIndex;
// change the color of the closest face.
intersects[0].face.color = color;
intersects[0].object.geometry.colorsNeedUpdate = true;
}
}
推荐答案
在您的示例中,最终颜色是材料颜色 ( 0x00ff00 ) 和面颜色 ( 0xff0000 ) 的组件乘积,结果为黑色 (0x000000).
In your example, the final color is the component-wise product of the material color ( 0x00ff00 ) and the face color ( 0xff0000 ), which results in black ( 0x000000 ).
因此,当您有面部颜色时,最好将材质颜色设置为白色.
For that reason, when you have face colors, it is a good idea to set the material color to white.
three.js r.69
three.js r.69
这篇关于颜色叠加的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文