SKLightNode投射阴影问题

Question

我没有成功地让SKSpriteNode投射阴影,并且在从同一光源进入阴影时也会消失.我可以做到两个中的一个但不是两个.

根据文档:如果精灵位于由光投射的阴影内并且精灵的z位置低于光,则阴影会影响精灵的点亮方式.我所做的一切.我的SKLightNode的zPosition为100,所有其他节点的zPosition都较低.

我已经尝试了lightingBitMask,shadowCastBitMask和shadowedBitMask的任何和所有设置组合,但没有任何效果.

我发布了孤立的代码,重现了我的问题.蓝色的盒子投下阴影但没有被墙影覆盖.紫色的盒子没有阴影,被墙影覆盖.

灯光响应触摸运动,因此可以随意在屏幕上移动.该项目处于横向模式.

我错过了什么或没看到什么？

#import "GameScene.h"

@implementation GameScene {
    SKSpriteNode *lightBulb;
}

-(void)didMoveToView:(SKView *)view {

    typedef NS_OPTIONS(uint32_t, Level1LightCategory)
    {
        CategoryLightPlayer            = 1 << 0,
    };

    SKSpriteNode *worldNode = [SKSpriteNode spriteNodeWithColor:[SKColor clearColor] size:CGSizeMake(1136, 640)];
    worldNode.zPosition = 10;
    //worldNode.position = CGPointMake(self.size.width/2, self.size.height/2);
    [self addChild:worldNode];

    lightBulb = [SKSpriteNode spriteNodeWithColor:[SKColor yellowColor] size:CGSizeMake(20, 20)];
    lightBulb.zPosition = 100;
    lightBulb.position = CGPointMake(50, 50);
    [worldNode addChild:lightBulb];

    SKLightNode *light = [[SKLightNode alloc] init];
    //light.zPosition = 100; // <- tried setting this again but to no effect
    light.categoryBitMask = CategoryLightPlayer;
    light.falloff = 0.3;
    light.ambientColor = [UIColor whiteColor];
    light.lightColor = [[UIColor alloc] initWithRed:1.0 green:1.0 blue:1.0 alpha:1.0];
    light.shadowColor = [[UIColor alloc] initWithRed:0.0 green:0.0 blue:0.0 alpha:1.0];
    [lightBulb addChild:light];

    SKSpriteNode *wall = [SKSpriteNode spriteNodeWithColor:[SKColor redColor] size:CGSizeMake(10, 300)];
    wall.zPosition = 50;
    wall.position = CGPointMake(500, 200);
    wall.lightingBitMask = CategoryLightPlayer;
    wall.shadowCastBitMask = CategoryLightPlayer;
    wall.shadowedBitMask = 0x00000000;
    [worldNode addChild:wall];

    SKSpriteNode *box0 = [SKSpriteNode spriteNodeWithColor:[SKColor blueColor] size:CGSizeMake(30, 30)];
    box0.zPosition = 40;
    box0.position = CGPointMake(800, 200);
    box0.lightingBitMask = CategoryLightPlayer;
    box0.shadowCastBitMask = CategoryLightPlayer;
    box0.shadowedBitMask = CategoryLightPlayer;
    [worldNode addChild:box0];

    SKSpriteNode *box1 = [SKSpriteNode spriteNodeWithColor:[SKColor purpleColor] size:CGSizeMake(30, 30)];
    box1.zPosition = 40;
    box1.position = CGPointMake(800, 300);
    box1.lightingBitMask = CategoryLightPlayer;
    //box1.shadowCastBitMask = CategoryLightPlayer;
    //box1.shadowedBitMask = CategoryLightPlayer;
    [worldNode addChild:box1];  
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    CGPoint touchLocation = [touch locationInNode:self.scene];

    lightBulb.position = touchLocation;
}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    CGPoint touchLocation = [touch locationInNode:self.scene];

    lightBulb.position = touchLocation;
}

-(void)update:(CFTimeInterval)currentTime {
    //
}

@end

Answer 1

我刚从Apple开发者技术支持部门回复,确认这是SpriteKit(SKLightNode)中的一个错误.目前,他们不知道此问题的解决方法,但如果找到一个,我会更新.

根据他们的要求,我已经提交了一份错误报告.

更新2015年4月22日

SK engineering确认SpriteKit不支持阴影投射并在同一对象上阴影.目前没有解决方法.这个问题将在某个时候得到解决.

更新2015年12月15日

收到了Apple关于此问题的新回复.

Apple Developer Relations 14-Dec-2015 01:35 PM

没有计划解决这个问题.

我们现在正在结束这份报告.