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[//]: # (generated using SlashBack 0.2.0)
If you ever come across a situation where you need to **pass data from PyGLM**'s data types **to another library** that uses **external C code**, you should be able to accomplish your goal doing the following:
It doesn't matter which kind of PyGLM type you have, but let's pretend you have a **4x4 matrix** that you need to **pass to PyOpenGL**\.
``` Python
# a very important identity matrix
m = glm.mat4()
# a ctypes pointer to m's data
ptr = glm.value_ptr(m)
# size of m's data in bytes (here 4 * 4 * 4 = 64 bytes)
nbytes = glm.sizeof(m)
glBufferData(GL_UNIFORM_BUFFER, nbytes, ptr, GL_STATIC_DRAW)
```
This also works for any **vector, quaternion or array** type\.
You can take a **shortcut for arrays** though:
``` Python
arr = glm.array(glm.mat4(1), glm.mat4(2), glm.mat4(3))
glBufferData(GL_UNIFORM_BUFFER, arr.nbytes, arr.ptr, GL_STATIC_DRAW)
```
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