\$\begingroup\$ After trying out RenderDoc, it seems like the triangle was drawn first, and the screen got cleared (filled with magenta) afterwards. Now that we have our default shader program pipeline sorted out, the next topic to tackle is how we actually get all the vertices and indices in an ast::Mesh object into OpenGL so it can render them. To get started we first have to specify the (unique) vertices and the indices to draw them as a rectangle: You can see that, when using indices, we only need 4 vertices instead of 6. This is a precision qualifier and for ES2 - which includes WebGL - we will use the mediump format for the best compatibility. The values are. Your NDC coordinates will then be transformed to screen-space coordinates via the viewport transform using the data you provided with glViewport. Clipping discards all fragments that are outside your view, increasing performance. WebGL - Drawing a Triangle - tutorialspoint.com The graphics pipeline takes as input a set of 3D coordinates and transforms these to colored 2D pixels on your screen. but we will need at least the most basic OpenGL shader to be able to draw the vertices of our 3D models. The code for this article can be found here. What would be a better solution is to store only the unique vertices and then specify the order at which we want to draw these vertices in. There are 3 float values because each vertex is a glm::vec3 object, which itself is composed of 3 float values for (x, y, z): Next up, we bind both the vertex and index buffers from our mesh, using their OpenGL handle IDs such that a subsequent draw command will use these buffers as its data source: The draw command is what causes our mesh to actually be displayed. Specifies the size in bytes of the buffer object's new data store. #include "../../core/log.hpp" Since our input is a vector of size 3 we have to cast this to a vector of size 4. #include However, for almost all the cases we only have to work with the vertex and fragment shader. Next we want to create a vertex and fragment shader that actually processes this data, so let's start building those. . Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Finally we return the OpenGL buffer ID handle to the original caller: With our new ast::OpenGLMesh class ready to be used we should update our OpenGL application to create and store our OpenGL formatted 3D mesh. The triangle above consists of 3 vertices positioned at (0,0.5), (0. .

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