Adding Reflection

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Intro

This document describes how to add reflection to a model. Be careful - mirror reflections are not very common and are not to be confused with Environment Reflections.

Limitations

The model itself must be capable of reflection. ac3d does not support reflection.

Example

% cd $DOUG_HOME
 % tar xvfz [datareflection.tgz][6]
 % mv userdata userdata.bk
 % ln -s datareflection userdata
 % mkdir textures
 % cp userdata/mars.rgb textures
 % ./run_graphics

Setup Reflection In Config File

• Commandline Options

  Add the following to the DSP_CONFIG.DOUG.command_line block: -reflections -reflection_grp 0xFFFFFFFF ;

     The hex number is a mask that enables/disables groups
     0xFFFFFFFF enables all groups
  

• Stencil Buffering

  Add the following to the DSP_CONFIG.DISPLAY.*.visual block STENCIL 8

     Example Block With Stenciling:
            DISPLAY
            {         
               DEFAULT
               { 
                    visual
                    {
                         RGBA        1 1 1 0
                         STENCIL     8
                         DEPTH       1
                         SAMPLES     −1
                         DITHER      OFF
                    }
               }
             }
  

• Reflection Group

  Add a DSP_CONFIG.DATA.SCENE_LOAD.GROUP.REFLECTIONS block with the following elements: group(); catcher(); caster(); source(<model that casts reflection onto "caster">);

     Multiple casters and sources can be specified in the group
     Multiple groups can be specified and enabled/disabled
     with the -reflection_grp mask
  
     Example Group:
  
           # CEV reflection configuration:
           GROUPS
           {
                 REFLECTIONS
                 {
                    group(1);
                    catcher(CEV_CDR_Eyepoint);
                    catcher(CEV_CDR_Eyepoint2);
                    caster(CEV_MIRROR_SURFACE);
                    source(CEV_COMMAND_MODULE);
                    source(CEV_CM_shell);
                    source(CEV_CM_SEATS);
                    source(CEV_CM_WIN1);
                    source(CEV_CM_WIN2);
                    source(CEV_CM_WIN3);
                    source(CEV_CM_WIN4);
                    source(CEV_CM_WIN5);
                    source(CEV_CM_SIDE_WIN1);
                    source(CEV_CM_SIDE_WIN2);
                    source(CEV_CM_SIDE_WIN3);
                    source(LAS);
                    source(CEV_crew_right);
                    source(CEV_crew_right_helmet);
                    source(CEV_crew_left);
                 }
            } 
  

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