3D AutoCAD 2010 for Starters and Others. . .
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3D AutoCAD 2010 for Starters and Others. . .
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Saturday January 02, 2010
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Rendering & Visualization
Rendering is the art of creating shaded or photo-realistic looking surfaces on a three-dimensional surfaced or solid 3D model to make it look more realistic. Visualization is simply mastering the AutoCAD features and techniques on how to view and display a 3D model. Rendering includes a combination of viewing the model, applying surface materials, creating camera views and adding and controlling lights illuminating a 3D object to make a 3D model look more realistic. · Viewing the model includes the use of predefined visual styles that mimic some renderings. A visual style helps to display the model in various formats, angles, views, and effects of shading and perspective. · Applying surface materials to a model is similar to applying hatch patterns in 2D. You simply drag materials from a predefined library onto any solid face or surface.Cameras can be placed to capture and save specifc 3D views of a model in order to present specific angles when preparing project presentations.
· Lighting can be added besides the default lighting for a finishing touch to the scene and enhancement of the clarity and three-dimensionality of the model.
Default Rendering Rendered images are useful for previewing a 3D model and also for presentations. Rendering is all about the process of illuminating a set of 3D objects and then creating a photorealistic and shaded image. By default, the RENDER command renders a 3D model in the Render Window without applying any materials, adding any lights, or setting up a scene. The default rendering automatically uses a distant light that cannot be moved or manipulated. Invoking the Render command automatically opens the Render Window and the image is processed. Upon completion, the image is displayed and a history entry is created. As more renderings occur, they are added to the output file list for comparison with earlier versions. Images can be saved or discarded from the Render dialog box. To use the RENDER command, apply the following procedure: 1. Open a 3D object drawing in the preferred Isometric view to render or create a suitable 3D model with colored faces or different layers with different colors to avoid creating a monochromatic rendering. See Figure 1.
Figure 1 The 3D model in SE Isometric view may be rendered for first review and presentation.
2. Select RENDER at the command prompt. The RENDER command can be invoked using the Browser, Toolbar or Ribbon tab.
By default, AutoCAD automatically creates a photorealistic and shaded 2D image based on the 3D model. It renders the scene's geometry using the default lighting without specific material selection or environmental settings such as background or shades. You may however, color some of the faces for special effects and render different views for variety of presentations. See Figure 2.
3. Select any of the output files listed below for viewing. Discard any unwanted versions from the output file list below by right-clicking and then selecting an option. Reenter the RENDER dialog box by using RENDERWIN at the command prompt.
Figure 2 AutoCAD default rendering when using the RENDER command.
4. Open an external photo imaging software such as Photoshop, PaintshopPro or IrfanView and manipulate your rendered image for improved presentation.
Figure 3 Any rendered image may be cropped, sharpened, and enhanced using a suitable photo imaging software.
Rendering can be improved using a custom rendering presets that may include the following:
Rendering in larger output than the default output size 640 X 480.
· Adding materials.
· Selecting special backgrounds.
· Selecting and adding lights and shadows.For more rendering, move to the Custom Rendering section below, following the sections on Materials & Textures, and Lighting shown hereafter.
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