tailieunhanh - Maya Secrets of the Pros Second Edition phần 5

Chiếu sáng, và kỹ thuật mềm mại và ngay cả ánh sáng tương tự có thể cung cấp mức độ chất lượng so với tốc độ khác nhau trong việc tạo ra các thẻ tắc môi trường xung quanh, bạn không cần mái vòm ánh sáng rộng lớn. Thử nghiệm để xem những gì bạn có thể tạo ra với một làm cho | 102 chapter 4 Radiosity and Image Based Lighting Techniques in Production Figure The Final Gathering result of the droid rendered and composited with the ambient occlusion pass Illumination and similar soft and even lighting techniques can provide varying levels of quality versus speed in generating the ambient occlusion pass you don t need the extensive light dome. Experiment to see what you can generate with a much faster Final Gathering render for your ambient occlusion pass. Figure shows you the final composited Droid with all his lighting passes. Illuminating Global Illumination A sphere or plane or any other surface for the matter with a self-illuminated incandescent surface shader and or an LDR or HDR file texture is used to create a single lighting scheme similar to a light dome. This scheme evenly lights a scene and creates natural soft shadows on the CG elements. Using a single color on the incandescence of the sphere creates a simple one-color light and is often used for evenly lighting models. The Final Gathering render bounces the light though only once off nearby surfaces for a more natural lighting effect. Modelers can use Final Gathering to quickly create soft light and natural shadows to show off their models in even lighting and be assured the model is showcased for its merits right off the bat. Using an image on the sphere s incandescence creates effective nuances to properly light CG into a particular background. This is perhaps one of the simplest ways to create IBL and is great for quickly adding color and proper values to work CG into a live-action plate. Even when no live-action is required carefully placing color and brightness in the mapped image can easily enhance the composition and the look of the CG. Illuminating Global Illumination 103 Once you create the sphere and map your lighting image simply turn of Primary Visibility in the object s Attribute Editor so it does not render out. It will then just act as the lighting for .