Introduction to the DirectX 9 Shader Models - Nvidia
Introduction to the DirectX 9 Shader Models - Nvidia
Introduction to the DirectX 9 Shader Models - Nvidia
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Precision Pitfalls<br />
• Avoid precision issues with Normalization<br />
Cubemaps<br />
• Use a normalization cubemap <strong>to</strong> normalize<br />
vec<strong>to</strong>rs derived from position<br />
– Texture coordinates are fp24+<br />
• Unless marked _pp<br />
• The resulting value from <strong>the</strong> cubemap is<br />
low-precision but derived at high precision