This chapter’s demo allows you to see the relationship between parent and child joints, and see what happens when an individual joint is manipulated, as shown in Figure 5.9. The demo allows you to pick from one of four joints… читать далее

A determinant is a scalar value calculated from the elements of a matrix. Determinants of matrices are useful for many tasks, such as solving system’s linear equations and calculating the area of a parallelogram or parallelepiped. You’ll use determinants in… читать далее

To display anything, you first need to get the data out of the file. You can start with the frames. Each frame starts with six floating-point values representing the scale and translation of the vertices on the X, Y, and… читать далее

The cross product can also be useful. Calculating the cross product of two vectors yields a vector that is perpendicular to both of them. This can be used to find vectors that are normal, or perpendicular, to a surface. This… читать далее

Let’s see what you can do about getting this thing onscreen. If you turn to the CObj::Render() function in obj. cpp, you will see what it takes to get everything onscreen. The first thing to do is to activate and… читать далее

You do not need a lot of programming experience to use this book. All of the code shown throughout the book is written in C++, so a basic understanding of C/C++ is a must. The demos on the CD are… читать далее

One of the most important aspects of quaternions is their ability to be converted into rotation matrices. This is useful because graphics APIs such as OpenGL and Direct3D cannot accept quaternions directly rather, they rely on matrices to perform transformations.… читать далее

On the left side of the screen, you will see a dialog box containing various controls and text boxes, as shown in Figure 5.10. О Joint 0 О Jort2 0 Jant 1 О Joint 3 Rotation X Y 2 |0.000… читать далее

Hey, what do you know, the last part of the matrix section is here already. That wasn’t so bad was it? This section is on the inverse of a matrix. The inverse of a matrix satisfies the following equation: M(M-1)… читать далее

Triangles in MD2 files are made using vertex indexes. For each tri­angle, three two-byte integer values are stored, each representing a vertex in the vertex array. If the three values are 4, 6, and 14, those values can be used… читать далее