shenlan282的笔记

http://www.arcsynthesis.org/gltut/Basics/Intro%20Graphics%20and%20Rendering.htmlGraphics and RenderingThis is an overview of the process of rendering. Do not worry if you do not understand

http://www.songho.ca/opengl/gl_projectionmatrix.htmlRelated Topics: OpenGL TransformationOverviewPerspective ProjectionOrthographic ProjectionOverviewA computer monitor is a 2D surface

Overlap and Depth BufferingRegardless of how we render the objects, there is a strange visual problem with what we're rendering:If the smaller object is truly behind the larger one, wh

Depth ClampingThat's all well and good, but this:This is never a good thing. Sure, it keeps the hardware from dividing by zero, which I guess is important, but it looks really bad.

Boundaries and ClippingIf you recall back to the Perspective projection tutorial, we choose to use some special hardware in the graphics chip to do the final division of the W coordinate,

Optimization: Base VertexUsing VAOs can dramatically simplify code. However, VAOs are not always the best case for performance, particularly if you use a lot of separate buffer objects.B

Multiple ShadersWell, moving the triangle around is nice and all, but it would also be good if we could do something time-based in the fragment shader. Fragment shaders cannot affect the pos

In this tutorial, we will look at how to deal with rendering multiple objects, as well as what happens when multiple objects overlap.Multiple Objects in OpenGLThe first step in looki

Chapter 4. Objects at RestThus far, we have seen very flat things. Namely, a single triangle. Maybe the triangle moved around or had some colors.This tutorial is all about how to create a

Aspect of the WorldIf you run the last program, and resize the window, the viewport resizes with it. Unfortunately, this also means that what was once a rectangular prism with a square front

http://www.arcsynthesis.org/gltut/Basics/Tut01%20Dissecting%20Display.htmlDissecting DisplayThe display function seems on the surface to be fairly simple. However, the functioning of it

http://www.arcsynthesis.org/gltut/Basics/Tutorial%2002.html#FragPositionChapter 2. Playing with ColorsThis tutorial will show how to provide some color to the triangle from the previous tuto

Chapter 3. OpenGL's Moving TriangleThis tutorial is about how to move objects around. It will introduce new shader techniques.Moving the VerticesThe simplest way one might th

http://www.arcsynthesis.org/gltut/Basics/Tut01%20Making%20Shaders.htmlMaking ShadersWe glossed over exactly how these text strings called shaders actually get sent to OpenGL. We will go

More Power to the ShadersIt's all well and good that we are no longer having to transform vertices manually. But perhaps we can move more things to the vertex shader. Could it be possible to m

A Better WayThis is fine for a 3-vertex example. But imagine a scene involving millions of vertices (and no, that's not an exaggeration for high-end applications). Moving objects this way mean

http://www.arcsynthesis.org/gltut/Basics/Tut01%20Following%20the%20Data.htmlFollowing the DataIn the basic background section, we described the functioning of the OpenGL pipeline. We wil

原文地址http://www.arcsynthesis.org/gltut/Basics/Tut02%20Vertex%20Attributes.htmlVertex AttributesUsing the fragment position in a fragment shader is quite useful, but it is far from the best

Perspective ProjectionRecall that our destination image, the screen, is just a two dimensional array of pixels. The 3D rendering pipeline we are using defines transformations of vertex posit