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POWaveFront .obj loader doesn't display the object like it should (VBO & VAO)
 

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  1. POWaveFront .obj loader doesn't display the object like it should (VBO & VAO)
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    <p>I'm working on a WaveFront .obj Loader and my first goal is to get all the vertices and indices loaded from the following .obj file (displays a cube with curved edges).</p> <pre><code># Blender v2.62 (sub 0) OBJ File: 'Cube.blend' # www.blender.org o Cube v 0.900000 -1.000000 -0.900000 v 0.900000 -1.000000 0.900000 v -0.900000 -1.000000 0.900000 v -0.900000 -1.000000 -0.900000 v 0.900000 1.000000 -0.900000 v 0.899999 1.000000 0.900001 v -0.900000 1.000000 0.900000 v -0.900000 1.000000 -0.900000 v 1.000000 -0.900000 -1.000000 v 1.000000 -0.900000 1.000000 v -1.000000 -0.900000 1.000000 v -1.000000 -0.900000 -1.000000 v 1.000000 0.905000 -0.999999 v 0.999999 0.905000 1.000001 v -1.000000 0.905000 1.000000 v -1.000000 0.905000 -1.000000 f 1//1 2//1 3//1 f 1//1 3//1 4//1 f 13//2 9//2 12//2 f 13//2 12//2 16//2 f 5//3 13//3 16//3 f 5//3 16//3 8//3 f 15//4 7//4 8//4 f 15//5 8//5 16//5 f 11//6 15//6 16//6 f 11//6 16//6 12//6 f 14//7 6//7 7//7 f 14//7 7//7 15//7 f 10//8 14//8 11//8 f 14//8 15//8 11//8 f 13//9 5//9 6//9 f 13//9 6//9 14//9 f 9//10 13//10 10//10 f 13//11 14//11 10//11 f 9//12 1//12 4//12 f 9//12 4//12 12//12 f 3//13 11//13 12//13 f 3//14 12//14 4//14 f 2//15 10//15 11//15 f 2//15 11//15 3//15 f 1//16 9//16 10//16 f 1//16 10//16 2//16 f 5//17 8//17 7//17 f 5//17 7//17 6//17 </code></pre> <p>I've loaded all the vertices and the indices in two vectors called verticesVec and indicesVec and I've checked them both (they have all the input in the correct order, verticesVec[0] = 0.9 and indicesVec[0] = 1). I load the vertices in a VertexBufferObject and the indices in a VerticArrayObject together with the shader fields settings. </p> <p>However, when I'm rendering the cube I get the following image which is not correct. I've rechecked all my code but I can't find the part where I'm going wrong. Has it something to do with the vectors and the size in bytes of the vectors?</p> <p><a href="http://imageshack.us/a/img850/6249/wrongcube.png" rel="nofollow noreferrer">wrong cube http://imageshack.us/a/img850/6249/wrongcube.png</a></p> <p>The following code is from my Draw/Render method that does all the rendering.</p> <pre><code> glUseProgram(theProgram); GLuint modelToCameraMatrixUnif = glGetUniformLocation(theProgram, "modelToCameraMatrix"); GLuint perspectiveMatrixUnif = glGetUniformLocation(theProgram, "cameraToClipMatrix"); glUniformMatrix4fv(perspectiveMatrixUnif, 1, GL_FALSE, glm::value_ptr(cameraToClipMatrix)); glm::mat4 identity(1.0f); glutil::MatrixStack stack(identity); // Load identity Matrix // Push for Camera Stuff glutil::PushStack camera(stack); stack.Translate(glm::vec3(camX, camY, camZ)); //Push one step further to fix object 1 glutil::PushStack push(stack); stack.Translate(glm::vec3(0.0f, 0.0f, 3.0f)); // Draw Blender object glBindVertexArray(this-&gt;load.vertexArrayOBject); glUniformMatrix4fv(modelToCameraMatrixUnif, 1, GL_FALSE, glm::value_ptr(stack.Top())); glDrawElements(GL_TRIANGLES, this-&gt;load.indicesVec.size(), GL_UNSIGNED_SHORT, 0); // Pop camera (call destructor to de-initialize all dynamic memory) camera.~PushStack(); // Now reset all buffers/programs glBindVertexArray(0); glUseProgram(0); </code></pre> <p>And the initialisation of buffer objects in my .obj loader:</p> <pre><code>void Loader::generateVertexBufferObjects() { // Fils the vertex buffer object with data glGenBuffers(1, &amp;vertexBufferObject); glBindBuffer(GL_ARRAY_BUFFER, vertexBufferObject); glBufferData(GL_ARRAY_BUFFER, verticesVec.size() * 4, &amp;verticesVec[0], GL_STATIC_DRAW); glBindBuffer(GL_ARRAY_BUFFER, 0); // Fills the index buffer object with its data glGenBuffers(1, &amp;indexBufferObject); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBufferObject); glBufferData(GL_ELEMENT_ARRAY_BUFFER, indicesVec.size() * 4, &amp;indicesVec[0], GL_STATIC_DRAW); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); } void Loader::generateVertexArrayObjects() { glGenVertexArrays(1, &amp;vertexArrayOBject); glBindVertexArray(vertexArrayOBject); glBindBuffer(GL_ARRAY_BUFFER, vertexBufferObject); glEnableVertexAttribArray(0); glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBufferObject); glBindVertexArray(0); } </code></pre>
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    1. USJoey Dewd
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    1. COCheck your indices. The indices in the obj start at 1, but in openGL they start at zero, so you may have to subtract one from all the indices.
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      1. USVaughn Cato
    2. CO@VaughnCato: Good one! Never thought about that. I added a index--; before adding it to the vector but unfortanetly it's still one messy cube so there is something more wrong than just the indices :(.
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      1. POWaveFront .obj loader doesn't display the object like it should (VBO & VAO)
      1. USJoey Dewd
    3. COAre your indices really shorts? You've allocated 4 bytes per value, but then told OpenGL they are unsigned short.
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