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In this blog, I will share my experience completing\u00a0 the second assigment for course Ceng469 Computer Graphics 2.<\/p>\n
For this assignment, I implemented a deferred and multi-pass renderer with HDR environment lighting, motion blur, and tone mapping.I rendered the given cubemap texture an armadillo model with multiple modes and multiple passes.These modes include rendering the world positions and normals of the model, rendering the model with deferred lighting, showing only the cubemap background, the combined results, the combined results with motion blur, and a final result with tonemapping and motion blur applied to both the model and the cubemap.<\/p>\n
I started with a key feature of this assignment ,which was rendering a cubemap\u00a0 to create a 360\u00b0 environment around the viewer. The idea was to simulate looking around in a 3D space.<\/p>\n
The cubemap rendering was one of the more straightforward parts of the assignment, because OpenGL\u00a0 has native cubemap support.<\/p>\n
I started by setting up a vertex buffer for the cubemap and reading the cubemap texture .Then, I created a shader program for rendering the cubemap. I also set up the exposure values to linearly scale the input color.<\/p>\n
Next, I bound the cubemap texture and used it as input for the shader. I cleared the color and depth buffers before rendering the cubemap. Finally, I drew the cubemap using a simple cube geometry.<\/p>\n
After i rendered the cubemap , I implemented rotating the view by using\u00a0 the middle mouse button , you can smoothly rotate the view by moving the mouse. The scene adjusts accordingly, making it feel like you’re navigating within a virtual world. The background remains static while the view shifts, which gives the illusion of being inside a 360-degree environment.<\/p>\n
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This part was also relatively straightforward to implement, though I ran into an issue while rendering the world positions. I started by creating a framebuffer object (FBO) for the geometry pass and creating the geometry shaders. Then, I set up a function to handle the geometry pass and created separate shaders for visualizing world positions and normals.<\/p>\n\n\n\n
At first, the world position output didn\u2019t look smooth\u2014it came out looking like a scattered point cloud. After some trial and error, I realized the problem was likely related to how the data was being stored or accessed from the G-buffer. To work around it, I temporarily solved the issue by rendering the world positions directly in the shader instead of sampling from the geometry buffer. (I was supposed to fix the issue properly later\u2014probably something to do with the G-buffer setup.)<\/p>\n\n\n\n
I also animated the model by continuously rotating it around the Y-axis to visualize better.<\/p>\n\n\n\n
Normal visualization, on the other hand, worked as expected without much trouble.<\/p>\n\n\n\n