docs: update resources API docs
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# Material::GetFloat
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```cpp
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float GetFloat(const Containers::String& name) const;
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```
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获取浮点属性值。如果属性不存在则返回 0.0f。
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**参数:**
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- `name` - 属性名称
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**返回:** 浮点属性值,不存在则返回 0.0f
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**线程安全:** ✅
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**复杂度:** O(1)
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**示例:**
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```cpp
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float roughness = mat->GetFloat("roughness");
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```
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## 相关文档
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- [Material](material.md) - 返回类总览
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