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Chapter 29 Advanced Lighting and Radiosity

727

Figure 29-7: The radiosity solution for this scene adds to the lighting levels for the entire room.

Using Local and Global Advanced Lighting Settings

Just like with the Light Tracer, you can set advanced lighting settings locally for specific objects using the Object Properties dialog box, opened with the Edit Object Properties menu command. This dialog box includes an Advanced Lighting panel, and several of the settings are specific to Radiosity.

For the selected objects, you can specify whether they Cast Shadows and Receive Illumination. For a radiosity solution, you can also select to enable or disable Diffuse, Specular, Regathering, and Subdividing. The Radiosity Refine Iterations value lets you set the number of iterations for the current selection.

If any light objects are selected, you can select to exclude them from radiosity processing or to store the illumination values with the mesh.

The Preference Settings dialog box also includes a panel for Radiosity. Using this panel, shown in Figure 29-8, you can set the advanced lighting settings that apply to all objects globally.

728 Part VI Lighting

Figure 29-8: Use the Radiosity panel of the Preference

Settings dialog box to set global parameters.

In the Radiosity panel of the Preference Settings dialog box is an option to Display Reflectance & Transmittance Information. If this option is enabled, this information (average and maximum percent values) appears directly below the sample slots. You can also select to have the radiosity solution displayed in the viewports and to automatically process any refine iterations that are noted in the Object Properties dialog box for a given object. Radiosity processing includes a couple of warning dialog boxes that appear — one when the current solution is reset, and another to update the solution when the Start button is clicked. You can disable both of these warnings. The final option is to save the radiosity solution with the Max file. This slightly increases the file size, but it doesn’t require that you recalculate the radiosity solution when the file is opened again.

Working with Advanced Lighting Materials

Applying an advanced lighting solution can have a direct impact on the materials in the scene. The Material Editor includes two materials that are useful for working with advanced lighting: Advanced Lighting Override and Lightscape materials.

Advanced Lighting Override

The Advanced Lighting Override material type includes material parameters that override the global Advanced Lighting solution. These parameters let you set the amount of Reflectance, Color Bleed, Transmittance, Luminance, and Bump Map Scale that the material uses. This offers a way to make a specific material have its own defined lighting parameters.

Chapter 29 Advanced Lighting and Radiosity

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Lightscape Material

The Lightscape material type lets you apply a material to objects that are imported from Lightscape. They are used to control how the radiosity is mapped to objects. The Basic Parameters rollout includes values for Brightness, Contrast, Ambient Light, and Bump Amount. These values are applied in addition to the base material.

Using Lighting Analysis

To get information about the current lighting solution, you can use the Lighting Analysis tool. The scene must include a lighting solution before this tool is available. You can access this tool by selecting the Rendering Advanced Lighting Lighting Analysis menu command. This opens the Lighting Analysis dialog box, shown in Figure 29-9.

Figure 29-9: The Lighting Analysis dialog box displays the light values at the specified location.

From the Quantity drop-down list, you can select to view light values for Illuminance and Luminance. The cursor also changes into an eyedropper while the dialog box is open. Clicking with the eyedropper in one of the viewports displays the lighting values for that point in the Lighting Analysis dialog box.

Summary

This chapter extended your exploration of advanced lighting with a look at radiosity. In this chapter, you

Discovered radiosity

Used the Subdivide modifier

Set local and global advanced lighting settings

Used advanced lighting materials

In the next chapter, you learn the basics of animation and working with keys.

 

 

 

P A R T

Animation

VII

In This Part

Chapter 30

Animation Basics

Chapter 31

Animating with

Constraints and

Controllers

Chapter 32

Using the Expression

Controller

Chapter 33

Working with the

Track View