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Graphics pipeline and rendering
This document discusses 3D rendering and the graphics pipeline. It begins with an introduction and overview of the topics to be covered. It then proceeds to explain each stage of the graphics pipeline in detail, from the 3D modeling stage through vertex shading, projection, clipping, rasterization, and pixel shading. Different rendering techniques like radiosity and ray tracing are also introduced and compared. The document emphasizes that rendering is the process of converting a 3D scene into a 2D pixel image displayed on screen. It encourages students to complete a worksheet on rendering and the graphics pipeline, and provides a video tutorial and exercise on rendering textured 3D objects.
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Graphics pipeline and rendering
- 1. 3D modelling Rendering &the graphics pipeline
- 2. Last week What didwe do in last weeks 3D modelling lesson?
- 3. This week You willbe learning about rendering & the graphics pipeline.
- 4. By the endof today you MUST understand what rendering is SHOULD be able to explain what the graphics pipeline is COULD produce some high quality renders of your game
- 5. Recap Real or Fake– shout out the answers
- 6. Real or Fake– shout out the answers
- 7. Real or Fake– shout out the answers
- 8. Real or Fake– shout out the answers
- 9. Real or Fake– shout out the answers
- 10. Real or Fake– shout out the answers
- 11. Real or Fake Reallife object 3D renders
- 12. Today we’re goingto look at the graphics pipeline & rendering
- 13. The graphics pipelineis how we take a 3D world…. And turn it into a 2D image displayed on a screen (gameplay),
- 14. Graphics pipeline Is theseries of processes the computer goes through converting the 3D game world into a 2D image on your screen. From this…. To this….
- 15. Graphics pipeline We callthis process of turning a 3D model into a 2D image “rendering” From this…. To this….
- 16. Every process hasstages… Texturing
- 17.
- 18. 2. Vertex shaders Vertexshaders work out where each vertex is on the model in X, Y & Z co-ordinates. . Don’t be confused by the word shader here… think about the vertex
- 19. Projection Now we knowwhat the objects shapes are, we need to figure out what our camera is looking at in the scene. This is called projection.
- 20. Clipping Now we knowwhat’s going to be on our screen (what the cameras looking at) we can get rid of anything that’s outside of the cameras view, clearing up memory.
- 21. 4. Rasterization We mustnow convert the 3D vector shapes (made of mathematical co-ordinates) in our cameras view (its frustrum) into a 2D raster image (an image made up of pixels). We call this rasterizing
- 22. But why dowe need to convert our 3D world to a pixel based image? The cameras screen is made up of pixels! Its how it displays images.
- 23. Pixel shaders Pixel shadersnow set the value for each pixel on the screen. The value work out how the object looks close up; how it reflects or absorbs light, its colour and its bump map.
- 24. Pixel shaders &Texturing The texture file being held in the computers memory is applied to the object in this stage of the pipeline
- 25. At the endof the pipeline we now have our rendered image on screen This will change twice a second for 60FPS games….
- 26. There are differenttypes of rendering Radiosity Calculates how light bounces off objects within the scene, leading to soft shadows and diffuse lighting Ray tracing Calculates the path of a light beam, leading to good reflections and sharp shadows
- 27. There are differenttypes of rendering Notice the difference in shadows and light reflection and absorption
- 28.
- 29. Render engines are thepart of the software that powers the process of rendering.
- 30. Blender has 2render engines
- 31. Blender Render versusCycles
- 32. Which produces betterlooking images?
- 33. Blender Render versusCycles Cycles renders look better; they are higher quality and more photo-realistic BUT it takes the program much longer to render each image.
- 34. Lets look atCycles in action…
- 35. Today Working alone, fillin the worksheet “Rendering & the graphics pipeline – worksheet”. You can find this on Moodle. Submit this to the Moodle assignment “Rendering worksheet” AFTER you have done this watch the video tutorial on rendering and render some textured primitives.
- 36. Whole class feedback Renderout a textured image of your chair. Put it on the screen for others to see.