3D Graphics with XNA Game Studio 4.0 by Sean James

By Sean James

This booklet is designed as a step by step educational that may be learn via from starting to finish, with each one bankruptcy development at the final. each one part, besides the fact that, can be used as a reference for enforcing quite a few digital camera types, 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 tasks. through the tip of the 1st bankruptcy you have created the framework that's used and greater upon for the remainder of the booklet, and by way of the tip of the e-book you may have carried out dozens of lighting tricks, digicam kinds, lighting fixtures versions and extra utilizing that framework. This e-book is especially written when you are acquainted with item orientated programming and C# and who're drawn to taking 3D pictures in their XNA video games to the subsequent point. This publication can be invaluable as studying fabric if you are new to portraits and should you want to extend their toolset. additionally, it may be utilized by online game builders trying to find an implementation consultant or reference for results or options they're already accustomed to.

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Let's add some functionality to our CModel class to calculate bounding spheres for us. CopyAbsoluteBoneTransformsTo(modelTransforms); buildBoundingSphere(); ... However, there is one problem with this approach: this bounding sphere is centered at the origin, so if we were to move our model, the bounding sphere would no longer contain the model. Transform(worldTransform); return transformed; } } [ 28 ] Chapter 1 View frustum culling One usage of our new bounding sphere system is to determine which objects are onscreen.

A UV coordinate of (0, 0) corresponds to the top-left of the texture and (1, 1) corresponds to the bottom-right. The texture coordinates allow us to wrap twodimensional textures onto the three-dimensional surfaces of our models. UV); return float4(output, 1); } If you run the game now, you will see that the textures are properly drawn onto the models: Texture sampling The problem with texture sampling is that we are rarely able to simply copy each pixel from a texture directly onto the screen because our models bend and distort the texture due to their shape.

The following line does just this, and should be inserted before the VertexShaderOutput is returned from the vertex shader. Note that the value is "normalized" with the normalize() function. This resizes the normal vector to length 1 as it may have been scaled by the world matrix, which would cause the lighting to be incorrect later on. As discussed earlier, keeping our vectors at length 1 keeps dot products simple. Normal, World); We also need to add a parameter at the beginning of the effect for the light direction.

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