Updating opengl buffers after changing attributes of a mesh

[IasonM]

I am using opengl in order to visualize geometric deformations on 3d meshes. I am using a vao to draw the mesh. This is the code I use to setup the buffers and the vao

void setupDrawingBuffers()     {         glGenVertexArrays(1, &VAO);         glGenBuffers(1, &VBO);         glGenBuffers(1, &EBO);         glBindVertexArray(VAO);         glBindBuffer(GL_ARRAY_BUFFER, VBO);         glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(MyVertex),             &vertices[0], GL_DYNAMIC_DRAW);         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);         glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(GLuint),             &indices[0], GL_DYNAMIC_DRAW);         glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(MyVertex),             (GLvoid*)0);         glEnableVertexAttribArray(0);         glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(MyVertex),             (GLvoid*)offsetof(MyVertex, Normal));         glEnableVertexAttribArray(1);         glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, sizeof(MyVertex),             (GLvoid*)offsetof(MyVertex, Color));         glEnableVertexAttribArray(2);         glBindVertexArray(0); }

After I do a transformation of the mesh data (deforming some vertices lets say) I want to update the buffers so the changes I did can be rendered. How do I correctly do that?


What I tried:
1)After the deformation I called setupDrawingBuffers() but nothing was rendered on screen.
2)Instead of calling setupDrawingBuffers() after the deformation I called it in my rendering loop. That worked but it is obviously wrong since my setupDrawingBuffers function generates new buffers each time it is called which results in a memory leak on every rendering cycle.

[Kai]

First of all, this isn't Java/LWJGL. And second, are you sure you understand what that code is doing?
Have a look at glBufferSubData.
It allows to update (a subrange of) the buffer data.