Light modo 401 extension

Extension information
Purpose: Custom light settings Company(s): Luxology Product(s): modo 401 Last updated: 17 Aug 09 Contact for technical issues: [email protected]
This article is part of the COLLADA extensions directory
Adding to the extensions directory

<extra>/<technique profile="modo401">/<param> Elements

Category: (core) Lighting (See list of specification categories)

Introduction: Describes custom light settings, including various light sub-types supported by modo 401.

Concepts

The modo render engine provides a general purpose collection of light settings and light sub-types, including both the basic directional, point, and spot lights specified by the common COLLADA technique, as well as more specialized light sub-types such as area lights and physically correct sunlights.

Attributes

Name	Type	Description	Required?
sid	xs:ncname	A unique symbol within the technique; one for each param.	Yes
name	xs:ncname	A user-friendly name for the param.	No

Related Elements

Parent element(s)	<visual_scene>
Extra and/or Technique	<extra>/<technique profile="modo401">
Child elements	None
Other

Light sub-type sun_light Child Elements

sid	name	Description	type	Default	Occurrences	Named values
lightType	Light_Type	Sub-type of the light	Name	N/A	1	sun_light
render	Render	If light contributes to the final rendered scene	Name	default	0 or 1	on, off, default
size	Display_Size	Size of the light apparatus in the 3D viewport	float	1.0	0 or 1
dissolve	Dissolve	Amount by which light effect is faded	float	0.0	0 or 1
radiance	Radiant_Intensity	Watts per volumetric meter	float	3.0	1
samples	Samples	Samples used for soft edge shadows	int	64	0 or 1
shadType	Shadow_Type	Shadow rendering method	Name	raytrace	0 or 1	none, raytrace, shadowmap
shadRes	Shadow_Resolution	Resolution of calculated deep shadow map	int	1024	0 or 1
fast	Simple_Shading	If specular and diffuse calculated regardless of spread angle	bool	true	0 or 1
azimuth	Azimuth	Arc of the horizon measured clockwise	float	0	1
clamp	Clamp_Intensity	If overall brightness of the sun is limited	bool	true	1
day	Day	Year * 1000 + Day of the Year	int	2009172	1
elevation	Elevation	Angle of altitude off the horizon	float	0	1
haze	Haze	Amount of haze in the air	float	2	1
height	Height	Depth of volume extending from front of light	float	10	1
lat	Latitude	Latitude in radians	float	0.655057	1
lon	Longitude	Longitude in radians	float	-2.13456	1
mapSize	Map_Size	Size of shadow map, in meters	float	2	1
north	North	Offset for north direction	float	0	1
radius	Radius	Circular region around the light, where volume effect originates	float	0.5	1
spread	Spread	Angle to control edge softness	float	0	1
sunPos	Sun_Position	Physical sun positioned by time and location.	bool	false	0 or 1
time	Time	Time of day	float	12	0 or 1
timeZone	Time_Zone	Time zone	float	-8	0 or 1
volumetrics	Volumetrics	If volumetric lighting is enabled.	bool	false	0 or 1
vdissolve	Volumetrics_Dissolve	Percentage to fade volumetrics by.	float	0	0 or 1
vsamples	Volumetric_Samples	Number of samples for volumetrics.	int	40	0 or 1

Details

modo 401 supports the following light sub-types, as indicated by the initial param element identified by the "lightType" sid, as shown in the example later in this article:

• area_light
• cylinder_light
• dome_light
• photometric_light
• point_light
• spot_light
• sun_light

Examples

   <library_lights>
       <light id="Light-Directional_Light" name="Directional_Light">
           <technique_common>
               <directional>
                   <color sid="directional_light_rgb">1 1 1</color>
               </directional>
           </technique_common>
           <extra>
               <technique profile="modo401">
                   <param sid="lightType" name="Light_Type" type="Name">sun_light</param>
                   <param sid="azimuth" name="Azimuth" type="float">0</param>
                   <param sid="clamp" name="Clamp_Intensity" type="bool">true</param>
                   <param sid="day" name="Day" type="int">2009172</param>
                   <param sid="elevation" name="Elevation" type="float">0</param>
                   <param sid="haze" name="Haze" type="float">2</param>
                   <param sid="height" name="Height" type="float">10</param>
                   <param sid="lat" name="Latitude" type="float">0.655057</param>
                   <param sid="lon" name="Longitude" type="float">-2.13456</param>
                   <param sid="mapSize" name="Map_Size" type="float">2</param>
                   <param sid="north" name="North" type="float">0</param>
                   <param sid="radius" name="Radius" type="float">0.5</param>
                   <param sid="spread" name="Spread" type="float">0</param>
                   <param sid="sunPos" name="Sun_Position" type="bool">false</param>
                   <param sid="time" name="Time" type="float">12</param>
                   <param sid="timeZone" name="Time_Zone" type="float">-8</param>
                   <param sid="volumetrics" name="Volumetrics" type="bool">false</param>
                   <param sid="vdissolve" name="Volumetrics_Dissolve" type="float">0</param>
                   <param sid="vsamples" name="Volumetric_Samples" type="int">40</param>
               </technique>
           </extra>
       </light>
   </library_lights>