Graphics Programs Reference
In-Depth Information
Chapter 10. Rendering and Illumination
After creating a 3D model, it is time to present it as a virtual prototype: how it will look
when built or fabricated. In this chapter we will present the rendering process and all
related commands, as well as simulating natural and artificial lighting.
The topics covered in this chapter are as follows:
• Understanding rendering
• How to create photorealistic images
• How to create test renders
• Identify generic and photometric lighting
• How to illuminate a scene
• How to apply lighting from the Sun and the sky
• How to apply point lights, spot lights, and other lights
• How to manage and adjust lights
Rendering concepts and commands
We present all rendering concepts and commands to obtain photorealistic images
from our 3D model.
General concepts
A fundamental output in all 3D models is the creation of photorealistic images, which
represent how the model will look after building or fabricating it. A render is, thus, an
image, which is defined in horizontal and vertical pixels obtained from a 3D model,
where AutoCAD calculates the visible faces and all lighting in the scene and even-
tually includes indirect lighting, applied materials, and some effects such as back-
ground.
After creating the 3D scene with all commands and methods already seen, a typical
rendering workflow is as follows:
1. Apply the camera's simulating user location, point to look at (target), and
perspective defining what we want to show.
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