# lv_gltf_math.hpp (/api/libs/gltf/math/lv_gltf_math_hpp)



GLTF math utilities and helper functions.

<ApiSummary functions="4" macros="1" />

Functions [#functions]

<ApiMember kind="function" name="lv_gltf_math_look_at_rh" file="libs/gltf/math/lv_gltf_math.hpp" line="35" url="https://github.com/lvgl/lvgl/tree/a7b95c5b0839ce901c09c205610bc2c77cc3345d/src/libs/gltf/math/lv_gltf_math.hpp#L35">
  lv_gltf_math_look_at_rh [#lv_gltf_math_look_at_rh]

  ```cpp title="cpp" lineNumbers=1
  fastgltf::math::fmat4x4 lv_gltf_math_look_at_rh(const fastgltf::math::fvec3 &eye, const fastgltf::math::fvec3 &center, const fastgltf::math::fvec3 &up) noexcept
  ```

  <span className="sr-only">
    Parameters
  </span>

  | Name     | Type                            |
  | -------- | ------------------------------- |
  | `eye`    | `const fastgltf::math::fvec3 &` |
  | `center` | `const fastgltf::math::fvec3 &` |
  | `up`     | `const fastgltf::math::fvec3 &` |
</ApiMember>

<ApiMember kind="function" name="lv_gltf_math_perspective_rh" file="libs/gltf/math/lv_gltf_math.hpp" line="36" url="https://github.com/lvgl/lvgl/tree/a7b95c5b0839ce901c09c205610bc2c77cc3345d/src/libs/gltf/math/lv_gltf_math.hpp#L36">
  lv_gltf_math_perspective_rh [#lv_gltf_math_perspective_rh]

  ```cpp title="cpp" lineNumbers=1
  fastgltf::math::fmat4x4 lv_gltf_math_perspective_rh(float fov, float ratio, float z_near, float z_far) noexcept
  ```

  <span className="sr-only">
    Parameters
  </span>

  | Name     | Type    |
  | -------- | ------- |
  | `fov`    | `float` |
  | `ratio`  | `float` |
  | `z_near` | `float` |
  | `z_far`  | `float` |
</ApiMember>

<ApiMember kind="function" name="lv_gltf_math_euler_to_quaternion" file="libs/gltf/math/lv_gltf_math.hpp" line="39" url="https://github.com/lvgl/lvgl/tree/a7b95c5b0839ce901c09c205610bc2c77cc3345d/src/libs/gltf/math/lv_gltf_math.hpp#L39">
  lv_gltf_math_euler_to_quaternion [#lv_gltf_math_euler_to_quaternion]

  ```cpp title="cpp" lineNumbers=1
  template <typename T>
  fastgltf::math::quat< T > lv_gltf_math_euler_to_quaternion(T P, T Y, T R)
  ```

  <span className="sr-only">
    Parameters
  </span>

  | Name | Type |
  | ---- | ---- |
  | `P`  | `T`  |
  | `Y`  | `T`  |
  | `R`  | `T`  |

  **Template Parameters:**

  | Name | Type       | Description |
  | ---- | ---------- | ----------- |
  | `T`  | `typename` |             |
</ApiMember>

<ApiMember kind="function" name="lv_gltf_math_quaternion_to_euler" file="libs/gltf/math/lv_gltf_math.hpp" line="60" url="https://github.com/lvgl/lvgl/tree/a7b95c5b0839ce901c09c205610bc2c77cc3345d/src/libs/gltf/math/lv_gltf_math.hpp#L60">
  lv_gltf_math_quaternion_to_euler [#lv_gltf_math_quaternion_to_euler]

  ```cpp title="cpp" lineNumbers=1
  template <typename T>
  fastgltf::math::vec< T, 3 > lv_gltf_math_quaternion_to_euler(fastgltf::math::quat< T > q)
  ```

  <span className="sr-only">
    Parameters
  </span>

  | Name | Type                        |
  | ---- | --------------------------- |
  | `q`  | `fastgltf::math::quat< T >` |

  **Template Parameters:**

  | Name | Type       | Description |
  | ---- | ---------- | ----------- |
  | `T`  | `typename` |             |
</ApiMember>

Macros [#macros]

<ApiMember kind="macro" name="M_PI" file="libs/gltf/math/lv_gltf_math.hpp" line="24" url="https://github.com/lvgl/lvgl/tree/a7b95c5b0839ce901c09c205610bc2c77cc3345d/src/libs/gltf/math/lv_gltf_math.hpp#L24">
  M_PI [#m_pi]

  ```c title=" " lineNumbers=1
  #define M_PI 3.14159265358979323846264338327950288
  ```
</ApiMember>

Dependencies [#dependencies]

<FileIncludes includes="[&#x22;lv_conf_internal.h&#x22;, &#x22;math.hpp&#x22;]" transitiveIncludes="[&#x22;lv_conf_kconfig.h&#x22;]" />