Question

使用精灵套件，我试图通过物理模拟使一系列球从空中掉落，我希望它们能够在不相互碰撞的情况下掉落并反弹。我只是想让他们直接走下去，互相穿过。我应该如何通过collisionBitMask和categoryBitMask来实现这一目标？

// Common.h
#ifndef Rainy_Poops_common_h
#define Rainy_Poops_common_h

static int poopSize_x = 20; 
static int poopSize_y = 20;
static const uint32_t poopCategory = 0x1 << 1;
#endif

// MyScene.h
-(void)update:(CFTimeInterval)currentTime {
/* Called before each frame is rendered */
_timer++;
if (_timer % 3 == 0) {
    SKSpriteNode * p = [[Poop alloc] init];
    NSInteger random_x = arc4random_uniform([[UIScreen mainScreen]applicationFrame].size.width);
    p.position = CGPointMake(random_x, [[UIScreen mainScreen]applicationFrame].size.height - 5);
    [self addChild: p];

    [self enumerateChildNodesWithName:@"poop" usingBlock:
     ^(SKNode *node, BOOL *stop) {
         Poop *poop = (Poop *) node;

         if (!poop.isDropping) {
             poop.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(poopSize_x, poopSize_y)];
             poop.isDropping = YES;
         }

         if (poop.position.y < 0) {
             [poop removeFromParent];
         }
     }];
   }
}

#import "Poop.h"

@implementation Poop
- (id)init {
    self = [super initWithImageNamed:@"poop2.png"];
    self.isDropping = NO;

    self.name = @"poop";
    self.size = CGSizeMake(poopSize_x, poopSize_y);

    SKPhysicsBody *physicsPoop = self.physicsBody;
    physicsPoop.collisionBitMask = 0;
    physicsPoop.categoryBitMask = poopCategory;
    physicsPoop.affectedByGravity = YES;
    physicsPoop.mass = 100;
    physicsPoop.allowsRotation = NO;
    physicsPoop.dynamic = YES;

    return self;
}
@end

Answer 1

我认为你的问题与这一行有关 -

poop.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(poopSize_x,poopSize_y)];

您在节点的初始化中将categoryBitMask初始化为2并将collisionBitMask初始化为0，但此行将重置您的大便的physicsBody并指定默认的collisionBitMask和{{ 1}} categoryBitMask

的值

Answer 2

将collisionButMask设置为0表示没有碰撞，或者等于你希望球碰撞的精灵的categoryBitMask。

如何使球忽略彼此的碰撞

2 个答案: