Part IV Drawing in Three Dimensions in .NET

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Part IV Drawing in Three Dimensions
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Types of shadows
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AutoCAD creates three different types of shadows. Table 25-1 compares these types of shadows.
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Table 25-1 Shadow Characteristics
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Type Volumetric Which Renderer to Use Photo Real or Photo Raytrace Photo Real or Photo Raytrace Photo Raytrace Description Based on volume of space cast by object s shadow Based on the map size that you set Calculated by tracing the path of rays from a light Characteristics Hard edges, outlines are approximate, affected by color of transparent objects Soft edges you can adjust, not affected by the color of transparent objects Hard edges, accurate outlines, affected by color of transparent objects
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Maps
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Raytraced
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Base your choice of the type of shadows you want on the shadow characteristics and your needs.
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Shadow settings
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To create shadows, you need to turn on shadows in two places. When you create a new light, you check Shadow On in the dialog box you use to create the new light. In addition, you need to check Shadows in the Rendering Options section of the Render dialog box. This shadows option is available only if you choose Photo Real or Photo Raytrace as the type of rendering in the Render dialog box. You set shadow settings when you create or modify a light source. Click Shadow Options to open the Shadow Options dialog box, shown in Figure 25-12. Check Shadow Volumes/Raytrace Shadows to create volumetric shadows with Photo Real rendering and raytraced shadows with Photo Raytrace rendering. The shadow map settings are disabled. If you uncheck Shadow Volumes/Raytrace Shadows, you can create a shadow map. You can set the shadow map size from 64 to 4,096 pixels. Larger map sizes are more accurate but take longer to render.
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25 Rendering in 3D
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Figure 25-12: The Shadow Options dialog box
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Set the shadow softness from 1 to 10 pixels. This determines the number of pixels at the edge of the shadow that are blended into the rest of the image, creating the soft effect. AutoCAD recommends using a setting from 2 to 4. Choose Shadow Bounding Objects to temporarily return to the drawing to select objects for creating a bounding box that AutoCAD uses to clip the shadow maps.
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The drawing used in the following Step-by-Step exercise on creating lights and shadows, ab25-a.dwg, is in the Drawings folder of the AutoCAD 2002 Bible CD-ROM.
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Step-by-Step: Creating Lights and Shadows
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1. Open ab25-a.dwg from the CD-ROM. OSNAP should be on. Set a running object snap for endpoint. 2. Save the file as ab25-2.dwg in your AutoCAD Bible folder. If the Render toolbar is not open, right-click any toolbar and choose Render. 3. Choose Lights from the Render toolbar. Choose Point Light from the drop-down list next to the New button. Click New to open the New Point Light dialog box.
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4. Type P1 in the Light Name text box. Click Modify. AutoCAD returns you to your drawing. Click Pan Realtime and pan to the right a couple of times until you see the floor lamp, as shown in Figure 25-13. Press Esc to exit Pan mode. At the Enter light location <current>: prompt, pick the endpoint shown in Figure 25-13. AutoCAD returns you to the New Point Light dialog box. 5. Set the Intensity to 250. In the Color section, click Select Custom Color and choose the yellow box in the first row. Notice that AutoCAD adjusts the RGB settings. Click OK. 6. Click Shadow On. Click OK to return to the Lights dialog box. 7. Choose Spotlight from the drop-down box and click New. Type S1 in the Light Name text box. Set the Intensity to 250. Click Modify. At the Enter light target <current>: prompt, pick an endpoint at the top of the bowl on the table. At the Enter light location <current>: prompt, type @0,0,5' to place the light directly over the table as a light hanging from the ceiling.
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Part IV Drawing in Three Dimensions
Figure 25-13: Picking the point light location
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8. Set the falloff to 55.00 and click Shadow On. Click OK to return to the Lights dialog box. 9. Choose Distant Light from the drop-down box and click New. Type D1 in the Light Name text box. Click Shadow On. 10. Click Sun Angle Calculator. Set the date to 9/1. Set the time to 8:00 in the morning. (You re having breakfast.) Set the time zone to CST. Click Daylight Savings. Set the latitude to 41.00 and the longitude to 91.57. The two drop-down list boxes below should read North and West. Click Geographic Locator to see where you ended up. (If you typed in the right latitude and longitude, the blue cross should be in southeast Iowa.) Click OK until you return to the Lights dialog box. 11. In the Lights dialog box, click North location. Type 90 degrees in the text box. Click OK twice to return to your drawing. 12. Choose Named Views from the View flyout of the Standard toolbar. Choose Render1, click Set Current, and click OK. 13. Choose Render from the Render toolbar. Crop Window should be unchecked. Change the Light Icon Scale to 24 so you can see the icons that AutoCAD creates at the location of each light you have created. (You should use the drawing scale factor.) In the Rendering Type drop-down list, choose Photo Real. Shadows should be unchecked. Click Render. The rendering should take less than a minute. It should look like Figure 25-14. There is more than enough light this time but remember you wouldn t normally eat breakfast with all the lights on. Notice the effect of the yellow point light.