我似乎无法让3D碰撞正常工作，当我运行我的引擎时，它认为我总是碰撞某些东西。以下是发生碰撞时执行某些操作的循环。
Camera cam = new Camera();
Obj obj = new Obj();
Collision c = new Collision(obj);
for(int i=0;i<obj.triangles.size();i+=3) {
if(c.triPntCol(obj.triangles.get(i), obj.triangles.get(i+1),obj.triangles.get(i+2), new Vector3f(cam.x,cam.y,cam.z))==true){
cam.x=cam.px;
cam.y=cam.py;
cam.z=cam.pz;
}
}
以下是碰撞类的方法。
public boolean triPntCol(Vector3f a,Vector3f b,Vector3f c,Vector3f p ){//Triangle point collision.
Vector3f v0=new Vector3f(c.x-a.x,c.y-a.y,c.z-a.z);
Vector3f v1=new Vector3f(b.x-a.x,b.y-a.y,b.z-a.z);
Vector3f v2=new Vector3f(p.x-a.x,p.y-a.y,p.z-a.z);
float dot00= (v0.x*v0.x)+(v0.y*v0.y)+(v0.z*v0.z);
float dot01= (v0.x*v1.x)+(v0.y*v1.y)+(v0.z*v1.z);
float dot02= (v0.x*v2.x)+(v0.y*v2.y)+(v0.z*v2.z);
float dot11= (v1.x*v1.x)+(v1.y*v1.y)+(v1.z*v1.z);
float dot12= (v1.x*v2.x)+(v1.y*v2.y)+(v1.z*v2.z);
float inv=1/((dot00*dot11)-(dot01*dot01));
float u=((dot11*dot02)-(dot01*dot12))*inv;
float v=((dot00*dot12)-(dot01*dot02))*inv;
if(u>=0 && v>=0 && u+v<1){
return true;
}
else return false;
}
最后这里是加载3D模型的代码。
public List<Vector3f> v = new ArrayList<Vector3f>();
public List<Vector3f> vn = new ArrayList<Vector3f>();
public List<Vector2f> vt = new ArrayList<Vector2f>();
public List<Face> face = new ArrayList<Face>();
public ArrayList color = new ArrayList<>();
public ArrayList colorFace = new ArrayList<>();
public ArrayList<Vector3f> triangles = new ArrayList<Vector3f>();
public Texture texture;
public Obj(){
}
public void load(File f,File mtl) throws IOException{//Gets data from obj and mtl files.
BufferedReader reader = new BufferedReader(new FileReader(f));
BufferedReader reader2 = new BufferedReader(new FileReader(mtl));
String line;
String line2;
String tag=null;
String tag2=null;
while((line = reader.readLine()) !=null){
if(line.startsWith("v ")){
float x = Float.valueOf(line.split(" ")[1]);
float y = Float.valueOf(line.split(" ")[2]);
float z = Float.valueOf(line.split(" ")[3]);
v.add(new Vector3f(x,y,z));
}
else if(line.startsWith("vn ")){
float x = Float.valueOf(line.split(" ")[1]);
float y = Float.valueOf(line.split(" ")[2]);
float z = Float.valueOf(line.split(" ")[3]);
vn.add(new Vector3f(x,y,z));
}
else if(line.startsWith("vt ")){
float x = Float.valueOf(line.split(" ")[1]);
float y = Float.valueOf(line.split(" ")[2]);
vt.add(new Vector2f(x,1-y));
}
else if (line.startsWith("f ")){
Vector3f vIndices = new Vector3f(Float.valueOf(line.split(" ")[1].split("/")[0]),Float.valueOf(line.split(" ")[2].split("/")[0]),Float.valueOf(line.split(" ")[3].split("/")[0]));
Vector3f nIndices = new Vector3f(Float.valueOf(line.split(" ")[1].split("/")[2]),Float.valueOf(line.split(" ")[2].split("/")[2]),Float.valueOf(line.split(" ")[3].split("/")[2]));
Vector3f tIndices = new Vector3f(Float.valueOf(line.split(" ")[1].split("/")[1]),Float.valueOf(line.split(" ")[2].split("/")[1]),Float.valueOf(line.split(" ")[3].split("/")[1]));
face.add(new Face(vIndices,nIndices,tIndices,texture.getTextureID()));
colorFace.add(tag);
colorFace.add(Float.valueOf(line.split(" ")[1].split("/")[0]));
colorFace.add(Float.valueOf(line.split(" ")[2].split("/")[0]));
colorFace.add(Float.valueOf(line.split(" ")[3].split("/")[0]));
}
else if (line.startsWith("usemtl ")){
//use what follows usemtl as a tag
tag = line.split(" ")[1];
//System.out.println(tag);
while((line2 = reader2.readLine()) !=null){
if (line2.startsWith("newmtl ")){
tag2 = line2.split(" ")[1];
}
else if(line2.startsWith("Kd ")){
float x = Float.valueOf(line2.split(" ")[1]);
float y = Float.valueOf(line2.split(" ")[2]);
float z = Float.valueOf(line2.split(" ")[3]);
color.add(tag2);
color.add(x);
color.add(y);
color.add(z);
}
else if(line2.startsWith("map_Kd ")){
texture = TextureLoader.getTexture("JPG", ResourceLoader.getResourceAsStream("res/"+line2.split(" ")[1]/*.split("\\\\")[10]*/));
System.out.println(line2.split(" ")[1]/*.split("\\\\")[6]*/);
}
}
}
}
reader.close();
reader2.close();
}