基于SceneKit的3D模型触碰事件

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

    // 获取到手势的对象
    UITouch *touch = [touches allObjects].firstObject;
    
    // 手势在SCNView中的位置
    CGPoint touchPoint = [touch locationInView:self.jpARSCNView];
    
    //该方法会返回一个SCNHitTestResult数组，这个数组中每个元素的node都包含了指定的点（CGPoint）
    NSArray *hitResults = [self.jpARSCNView hitTest:touchPoint options:nil];
    
    if (hitResults.count > 0) {
        
        SCNHitTestResult * hit = [hitResults firstObject];
        
        SCNNode *node = hit.node;

        if (node.geometry == self.jpBox) {
            NSLog(@"点击了箱子");
            [self removeBox];
            [self addBox];
            
        }
        
    }

}

SCNBox * box = [SCNBox boxWithWidth:0.18 height:0.18 length:0.18 chamferRadius:0];
        
        self.geometry = box;
        
        SCNPhysicsShape * shape = [SCNPhysicsShape shapeWithGeometry:box options:nil];
        
        self.physicsBody = [SCNPhysicsBody bodyWithType:SCNPhysicsBodyTypeDynamic shape:shape];
        
        [self.physicsBody setAffectedByGravity:NO];
        
        self.physicsBody.categoryBitMask = 1;
        self.physicsBody.contactTestBitMask = 2;