By Peter Shirley
Targeting the "nuts and bolts" of writing ray tracing courses, this new and revised version emphasizes useful and implementation matters and takes the reader via the entire info had to write a latest rendering approach.
Most importantly, the publication provides many C++ code segments, and provides new information to supply the reader with a greater intuitive knowing of ray tracing algorithms.
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Extra info for Realistic Ray Tracing
Example text
001f This book will discuss these fast estimate algorithms in later chapters. For vector comparisons, this book uses the following code. Listing 3-2: Comparing two {XYZ} vectors using a specified precision factor bool vmp_IsVEqual( const vmp3DVector * const pvA, const vmp3DVector * const pvB, float fPrec ) { ASSERT_PTR4(pvA); // See explanation of assert macros ASSERT_PTR4(pvB); // later in this chapter! vmp_IsFEqual(pvA->z, pvB->z, fPrec)) { return false; } return true; } When dealing with quad vectors (vmp3DQVector), an alternative function is called.
What is an assertion? 2. How many assertion types does the author recommend? What are they and what do they do? 3. Create another memory allocation scheme with code to allocate and release that memory for allocation of any size but still be properly aligned. 4. What should one do when allocating memory for a file load to guarantee that no memory access by a processor could accidentally get a memory exception for accessing past the end of allocating memory without special handling? 5. If a raw ASCII text file was loaded into memory, how would it be loaded and what is the easiest method of treating it as one large string?
Obviously, since there is no need for reallocations, or freeing of memory, there is no need for a header either. There are other schemes, but make sure your memory is 16-byte aligned. Now that any possible memory allocation alignment problems have been taken care of up front, it is time to move on to the good stuff. Stack Never, never, never pass packed data on the stack as a data argument. Always pass a pointer to the packed data instead. Ignoring any possible issues such as faster consumption of a stack, the need for more stack space, or security issues, such as code being pushed onto the stack, there is no guarantee that the data would be properly aligned.