Sean James's 3D Graphics with XNA Game Studio 4.0 PDF

By Sean James

ISBN-10: 1849690049

ISBN-13: 9781849690041

This booklet is designed as a step by step instructional that may be learn via from commencing to finish, with each one bankruptcy development at the final. each one part, although, is also used as a reference for imposing numerous digicam versions, lighting tricks, and so forth. The chapters are jam-packed with illustrations, screenshots, and instance code, and every bankruptcy relies round the production of 1 or extra instance initiatives. through the tip of the 1st bankruptcy you may have created the framework that's used and stronger upon for the remainder of the publication, and through the tip of the e-book you've carried out dozens of lighting tricks, digicam kinds, lights types and extra utilizing that framework. This publication is especially written in case you are conversant in item orientated programming and C# and who're attracted to taking 3D portraits in their XNA video games to the subsequent point. This e-book might be worthy as studying fabric if you are new to pix and if you want to extend their toolset. additionally, it may be utilized by online game builders trying to find an implementation advisor or reference for results or recommendations they're already accustomed to.

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With the groundwork out of the way, we can start recreating some of the lighting effects provided by the BasicEffect shader. Let's start with ambient lighting: Ambient lighting is an attempt at simulating all the light that bounces off of other objects, the ground, and so on, which would be found in the real world. If you look at an object that doesn't have light shining directly onto it, you can still see it because light has bounced off of other objects nearby and lit it somewhat. As we can't possibly simulate all the bounced rays of light (technically, [ 56 ] Chapter 2 we can with a technique called ray tracing, but this is very slow), we instead simplify it into a constant color value.

The next few lines are the vertex shader itself. Position = mul(worldPosition, viewProjection); return output; } The next bit of code makes up the pixel shader. It accepts a VertexShaderOutput struct as its input (which is passed from the vertex shader), and returns a float4— equivelent to XNA's Vector4 class, in that it is basically a set of four floating point (decimal) numbers. We use the COLOR0 semantic for our return value to let the pipeline know that this function is returning the final pixel color.

The first three lines in this effect are its effect paremeters. These three should be familiar to you—they are the world, view, and projection matrices (in HLSL, float4x4 is the equivalent of XNA's Matrix class). There are many types of effect parameters and we will see more later. float4x4 World; float4x4 View; float4x4 Projection; [ 50 ] Chapter 2 The next few lines are where we define the structures used in the shaders. In this case, the two structs are VertexShaderInput and VertexShaderOutput.

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3D Graphics with XNA Game Studio 4.0 by Sean James

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