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POOpenGL first person camera rotation and translation
 

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  1. POOpenGL first person camera rotation and translation
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    <p>I'm trying to write a simple maze game, without using any deprecated OpenGL API (i.e. no immediate mode). I'm using one Vertex Buffer Object for each tile I have in my maze, which is essentially a combination of four <code>Vertex</code>s:</p> <pre><code>class Vertex { public: GLfloat x, y, z; // coords GLfloat tx, ty; // texture coords Vertex(); }; </code></pre> <p>and are stored in VBOs like this:</p> <pre><code>void initVBO() { Vertex vertices[4]; vertices[0].x = -0.5; vertices[0].y = -0.5; vertices[0].z = 0.0; vertices[0].tx = 0.0; vertices[0].ty = 1.0; vertices[1].x = -0.5; vertices[1].y = 0.5; vertices[1].z = 0.0; vertices[1].tx = 0.0; vertices[1].ty = 0.0; vertices[2].x = 0.5; vertices[2].y = 0.5; vertices[2].z = 0.0; vertices[2].tx = 1.0; vertices[2].ty = 0.0; vertices[3].x = 0.5; vertices[3].y = -0.5; vertices[3].z = 0.0; vertices[3].tx = 1.0; vertices[3].ty = 1.0; glGenBuffers(1, &amp;vbo); glBindBuffer(GL_ARRAY_BUFFER, vbo); glBufferData(GL_ARRAY_BUFFER, sizeof(Vertex)*4, &amp;vertices[0].x, GL_STATIC_DRAW); ushort indices[4]; indices[0] = 0; indices[1] = 1; indices[2] = 2; indices[3] = 3; glGenBuffers(1, &amp;ibo); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo); glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(ushort) * 4, indices, GL_STATIC_DRAW); } </code></pre> <p>Now, I'm stuck on the camera movement. In a previous version of my project, I used <code>glRotatef</code> and <code>glTranslatef</code> to translate and rotate the scene and then I rendered every tile using <code>glBegin()</code>/<code>glEnd()</code> mode. But these two functions are now deprecated, and I didn't find any tutorial about creating a camera in a context using only VBOs. Which is the correct way to proceed? Should I loop between every tile modifying the position of the vertices according to the new camera position?</p>
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    1. USPietro Lorefice
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    1. COAre you using the fixed-function pipeline? Also, there is no concept of a camera in OpenGL. You multiply each vertex with a model-view-projection matrix (where the view matrix is the one you are interested in). You do that in your vertex shader (you can also use the matrix stack if you are _allowed_ to use the fixed function pipeline). And this question may be better suited for http://gamedev.stackexchange.com/
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    2. CO@Samaursa As I said, I'm not using the fixed-function pipeline, because from what I've read, it is deprecated. In my render method, I basically bind my VBOs and use the `glDrawElements()` method to render them. Besides, also the `glPopMatrix()` and `glPushMatrix()` methods are deprecated, so I don't really know where to start from.
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    3. COSee my answer (updated with several edits - apologize for that, I forgot to add one of the sections)
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