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Raycasting é o processo de disparar

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um raio invisível a partir de um ponto,

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em uma direção especificada para detectar se

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algum colisor se encontra no caminho do raio.

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Como por exemplo ao disparar uma arma.

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Nesse caso,

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nosso personagem quer atirar na caixa do mal

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que o traiu e matou seu pai.

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A sintaxe da função de raycast se parece com isso.

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Pode parecer confuso de inicio,

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mas quando você entender o que cada parte faz,

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fará muito mais sentido.

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Em primeiro lugar, a origem do raio é um

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ponto no espaço mundial (world space).

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Então, neste caso, escolheríamos um ponto

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em frente ao cano da arma,

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armazenado como um Vector3, uma posição X, Y e Z.

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No entanto, esta direção das coordenadas do mundo

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não vai informar a direção em que estamos disparando,

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precisaremos de um segundo Vector3

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para armazenar esta direção.

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Essas duas variáveis Vector3 compõem nosso raio.

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Mas também podemos substituir em uma

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variável Ray, pois esse tipo de dado

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pode armazenar dois Vector3's.

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Nosso código ficaria assim.

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O próximo argumento na função é

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uma variável RaycastHit que armazena

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informações sobre os colisores atingidos.

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Para que possa ser usado no código

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para informar quais objetos foram interceptados pelo raio.

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