我在让Physics.Raycast识别网格对撞机时遇到问题。我有一个自定义创建的网格模拟地形，以及一个可以用键盘和鼠标控制的相机对象。我试图在相机和地形之间实现碰撞，这样相机就无法在地形中移动。
这是生成网格的脚本。它附加到具有MeshCollider和MeshFilter组件的GameObject。请特别注意这些组件在脚本中设置mesh和sharedMesh属性的位置。
var divisions : int;
var size : float;
var height : float;
private var vertices : Vector3[];
private var numVertices : int;
private var cameraStartVertex : Vector3;
function Start () {
InitTerrain();
}
function InitTerrain() {
numVertices = (divisions + 1) * (divisions + 1);
vertices = new Vector3[numVertices];
var UVs : Vector2[] = new Vector2[numVertices];
var triangles : int[] = new int[divisions * divisions * 6];
var halfTerrainSize : float = size / 2;
var divisionSize : float = size / divisions;
//LOOK HERE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
var mesh : Mesh = new Mesh();
GetComponent.<MeshFilter>().mesh = mesh;
GetComponent.<MeshCollider>().sharedMesh = mesh;
GetComponent.<MeshCollider>().isTrigger = true;
var triangleOffset : int = 0;
for (var i = 0; i <= divisions; i++) {
for (var j = 0; j <= divisions; j++) {
vertices[i * (divisions+1) + j] = new Vector3(-halfTerrainSize + j * divisionSize, 0.0f, halfTerrainSize - i * divisionSize);
UVs[i * (divisions+1) + j] = new Vector2(parseFloat(i / divisions), parseFloat(j / divisions));
if (i < divisions && j < divisions) {
var topLeft : int = i * (divisions + 1) + j;
var bottomLeft : int = (i + 1) * (divisions + 1) + j;
// First triangle of square
triangles[triangleOffset] = topLeft;
triangles[triangleOffset + 1] = topLeft + 1;
triangles[triangleOffset + 2] = bottomLeft + 1;
// Second triangle of square
triangles[triangleOffset + 3] = topLeft;
triangles[triangleOffset + 4] = bottomLeft + 1;
triangles[triangleOffset + 5] = bottomLeft;
triangleOffset += 6;
}
}
}
initDiamondSquareCornerVertices();
performDiamondSquare();
mesh.vertices = vertices;
mesh.uv = UVs;
mesh.triangles = triangles;
mesh.RecalculateBounds();
mesh.RecalculateNormals();
}
function initDiamondSquareCornerVertices(){
vertices[0].y = Random.Range(-height, height);
vertices[divisions].y = Random.Range(-height, height);
vertices[vertices.length - 1].y = Random.Range(-height, height);
vertices[vertices.length - 1 - divisions].y = Random.Range(-height, height);
}
function performDiamondSquare(){
var numIterations : int = parseInt(Mathf.Log(divisions, 2));
var numSquares : int = 1;
var squareSize : int = divisions;
for (var i = 0; i < numIterations; i++){ // the iteration we're on
var row : int = 0;
for (var j = 0; j < numSquares; j++){
var column : int = 0;
for (var k = 0; k < numSquares; k++) {
diamondSquareStep(row, column, squareSize, height);
column += squareSize;
}
row += squareSize;
}
numSquares *= 2;
squareSize /= 2;
height *= 0.4f;
}
}
function diamondSquareStep(row : int, column : int, size : int, offset : float) {
var halfSize : int = parseInt(size * 0.5f);
var topLeft : int = row * (divisions + 1) + column;
var bottomLeft : int = (row + size) * (divisions + 1) + column;
var middle : int = parseInt((row + halfSize) * (divisions + 1) + parseInt(column + halfSize));
vertices[middle].y = (vertices[topLeft].y + vertices[topLeft + size].y + vertices[bottomLeft].y + vertices[bottomLeft+size].y) / 4 + Random.Range(-offset, offset);
vertices[topLeft + halfSize].y = (vertices[topLeft].y + vertices[topLeft + size].y + vertices[middle].y) / 3 + Random.Range(-offset, offset);
vertices[middle - halfSize].y = (vertices[topLeft].y + vertices[bottomLeft].y + vertices[middle].y) / 3 + Random.Range(-offset, offset);
vertices[middle + halfSize].y = (vertices[topLeft + size].y + vertices[bottomLeft + size].y + vertices[middle].y) / 3 + Random.Range(-offset, offset);
vertices[bottomLeft + halfSize].y = (vertices[bottomLeft].y + vertices[bottomLeft + size].y + vertices[middle].y) / 3 + Random.Range(-offset, offset);
}
这是附加到我的相机对象的脚本，它控制着相机的移动：
#pragma strict
var translationSensitivity : float = 15.0f;
private var mouseX : float;
private var mouseY : float;
function Start () {
rotX = 0;
rotZ = 0;
}
function Update () {
//Translation...
if(Input.GetKey(KeyCode.D)) {
var trans : Vector3 = new Vector3(translationSensitivity * Time.deltaTime,0,0);
if (!checkCollisionImminent(Vector3.right)){
transform.Translate(trans);
}
}
if(Input.GetKey(KeyCode.A)) {
trans = new Vector3(-translationSensitivity * Time.deltaTime,0,0);
if (!checkCollisionImminent(Vector3.left)){
transform.Translate(trans);
}
}
if(Input.GetKey(KeyCode.S)) {
trans = new Vector3(0,0,-translationSensitivity * Time.deltaTime);
if (!checkCollisionImminent(Vector3.back)){
transform.Translate(trans);
}
}
if(Input.GetKey(KeyCode.W)) {
trans = new Vector3(0,0,translationSensitivity * Time.deltaTime);
if (!checkCollisionImminent(Vector3.forward)){
transform.Translate(trans);
}
}
}
function checkCollisionImminent(direction : Vector3) {
return Physics.Raycast(transform.position, direction, 2);
}
你可以看到我设置了碰撞检查。但是相机对象继续直接穿过网格，我根本看不到问题。我做错了什么？
答案 0 :(得分：0)
如果你隔离checkCollisionImminent()并使其独立于按键，那会更好。现在的方式是，在移动方向以外的方向上的任何光线投射都不会触发。我会相应地更改update()函数：
function Update () {
var trans;
var w, s, a, d;
//Translation...
if(Input.GetKey(KeyCode.D)) {
trans = new Vector3(translationSensitivity * Time.deltaTime,0,0);
}
if(Input.GetKey(KeyCode.A)) {
trans = new Vector3(-translationSensitivity * Time.deltaTime,0,0);
}
if(Input.GetKey(KeyCode.S)) {
trans = new Vector3(0,0,-translationSensitivity * Time.deltaTime);
}
if(Input.GetKey(KeyCode.W)) {
trans = new Vector3(0,0,translationSensitivity * Time.deltaTime);
}
//Check collisions
w = checkCollisionImminent(Vector3.forward);
s = checkCollisionImminent(Vector3.back);
a = checkCollisionImminent(Vector3.left);
d = checkCollisionImminent(Vector3.right);
//Do nothing if there is a collision
if(w || s || a || d) {
return;
}
transform.Translate(trans);
}
我没有测试过这段代码，但它应该可以正常工作。如果这有帮助，请告诉我们。