これがプログラムのオーバーレイです。私は Visual Studio 10 、 c++ で opengl/glut を使用しています。迷路を作成しようとしています(入力ファイルから生成します)。次に、obj ローダー (glm) を使用して 3dstudio max から 2 つのモデルをインポートします。そしてモデルの1人(mo)が迷路の中を動き回ります。そこで、彼と迷宮の壁の周りにバウンディング ボックスを追加しました。mo の周りにボックスも描きましたが、キャラクターと一緒に移動/回転しているように見えます。しかし、何らかの理由で (適切な場所で行っていない可能性があります)、衝突テストでは何も検出されません。私はコードに話させます。質問があれば、喜んで解決します。今すぐコードの準備をしてください。
//bounding boxes
struct BoundingBox
{
Vector3D max;
Vector3D min;
};
BoundingBox *box_mo;
BoundingBox *static_box[400];
void initbox(BoundingBox *b){
b->min.x=100000;
b->min.y=100000;
b->min.z=100000;
b->max.x=-100000;
b->max.y=-100000;
b->max.z=-100000;
}
BoundingBox *CreateCollisionBox(GLMmodel *model,GLMgroup *object){
/* GLM doesn't store each vertex together with the object that owns it. It doesn't have that notion. In GLM object don't have vertex, they have triangles. And each triangle is actually an index in the triangle list of the object.*/
BoundingBox *boxx=(BoundingBox*)malloc(sizeof(BoundingBox));
initbox(boxx);
for(int i=0;i<object->numtriangles;i++){
// for each vertex of the triangle pmodel1->triangles[object->triangles[i]]
// calculate min and max
for(int j=0;j<3;j++){
GLuint index=model->triangles[object->triangles[i]].vindices[j];
GLfloat x = model->vertices[index*3 +0];
GLfloat y = model->vertices[index*3 +1];
GLfloat z = model->vertices[index*3 +2];
if(boxx->min.x>x) boxx->min.x =x;
if(boxx->min.y>y) boxx->min.y =y;
if(boxx->min.z>z) boxx->min.z =z;
if(boxx->max.x<x) boxx->max.x =x;
if(boxx->max.y<y) boxx->max.y =y;
if(boxx->max.z<z) boxx->max.z =z;
}
}
return boxx;
}
void AddCollisionBox(GLMmodel *model,GLMgroup *object){
//box[boxindex]=CreateCollisionBox(model,object);
box_mo=CreateCollisionBox(model,object);
//boxindex++;
}
// A GLMmodel has a chained list of groups, each group representing an object.
// Each object has a name (the name you gave it in 3D Studio Max or Gmax).
// Let's you have 10 walls in your scene a few other objects as well and you want to
// create collision boxes just for the walls and you do not want to make a collision box
// for one of your objects. You could name all your walls
// like this: Wall1, Wall2, ..., Wall10. If you wanted to add collision boxes just to them
// you could go through all objects in the scene and if their name contains "Wall" add them.
// with this one: strstr
// Basicly this function does just that: if you want to add boxes for the walls you would call it like this: DefineCollisionBoxes(model,"Wall");
void DefineCollisionBoxes(GLMmodel *model,char *name){
GLMgroup *group = model->groups;
while(group){
if(strstr(group->name,name))
AddCollisionBox(model,group);
group=group->next;
}
}
bool Collision(BoundingBox *b,GLfloat x,GLfloat y,GLfloat z){
return x <= b->max.x && x>= b->min.x && y<= b->max.y && y>= b->min.y && z<= b->max.z && z >= b->min.z;
}
bool CollisionTest(BoundingBox *a,BoundingBox *b){
/*bool collision=false;
for(int i=0;i<static_boxes;i++){
for(float x=static_box[i]->min.x, y=static_box[i]->min.y,z=static_box[i]->min.z ;x<=static_box[i]->max.x && y<=static_box[i]->max.y && z<=static_box[i]->max.z;x+=0.1,y+=0.1,z+=0.1){
if(Collision(a,x,y,z) == true)
collision=true;
}
}
return collision;*/
if(a->min.x <= b->max.x && a->max.x >= b->min.x && a->min.z <= b->max.z && a->max.z >= b->min.z && a->min.y <= b->max.y && a->max.y >= b->min.y)
return true;
return false;
}
void drawBox(BoundingBox *b){
glColor3f(1,1,1);
glBegin(GL_LINE_LOOP);
glVertex3f(b->max.x,b->max.y,b->min.z);
glVertex3f(b->min.x,b->max.y,b->min.z);
glVertex3f(b->min.x,b->min.y,b->min.z);
glVertex3f(b->max.x,b->min.y,b->min.z);
glEnd();
glBegin(GL_LINE_LOOP);
glVertex3f(b->max.x,b->min.y,b->max.z);
glVertex3f(b->max.x,b->max.y,b->max.z);
glVertex3f(b->min.x,b->max.y,b->max.z);
glVertex3f(b->min.x,b->min.y,b->max.z);
glEnd();
glBegin(GL_LINE_LOOP);
glVertex3f(b->max.x,b->max.y,b->min.z);
glVertex3f(b->max.x,b->max.y,b->max.z);
glVertex3f(b->min.x,b->max.y,b->max.z);
glVertex3f(b->min.x,b->max.y,b->min.z);
glEnd();
glBegin(GL_LINE_LOOP);
glVertex3f(b->max.x,b->min.y,b->max.z);
glVertex3f(b->min.x,b->min.y,b->max.z);
glVertex3f(b->min.x,b->min.y,b->min.z);
glVertex3f(b->max.x,b->min.y,b->min.z);
glEnd();
}
//display function
void display(){
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//setup view
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
camera.render
//read from file, create walls and characters
//place model mo in front of the third person camera always
Vector3D positionn;
positionn = camera.position + camera.forward*5;
glPushMatrix();
glColor3f(0.88f,0.75f,0.49f);
//here i move my character and calculate bounding box at each frame for him
glTranslatef(positionn.x,-0.42f,positionn.z);
glScalef(0.7f,0.7f,0.7f);
glRotatef(angle,0,1,0);
drawMo();
DefineCollisionBoxes(pmodel1,"body"); // actual function call
drawBox(box_mo); //draw bounding box
glPopMatrix();
//test if the character collides with any of the walls - not working
for(int i=0;i<static_boxes;i++){
if(CollisionTest(box_mo,static_box[i]) == true){
printf("collision");
}
}
//swap buffers
glutSwapBuffers();
}