topic Re: Lamp Color in Libraries & objects

Lamp Color

Dwight — Fri, 05 Nov 2004 09:13:28 GMT

How does the GDL lamp obtain its color from the color sampler wheel? I don't see anything in the script that makes the reference......

Re: Lamp Color

Aussie John — Fri, 05 Nov 2004 09:36:11 GMT

double click the colour button to bring up the colour wheel.
The lamp uses RBG as defined by
LIGHT_RED
LIGHT_GREEN
LIGHT_BLUE

Dwight, Im not sure if that has answered your query

Re: Lamp Color

Dwight — Fri, 05 Nov 2004 09:47:41 GMT

This is a scripting query - probably built in to the system somehow....

How is it done by the script?
What makes the object reference work?

Re: Lamp Color

Aussie John — Fri, 05 Nov 2004 10:14:08 GMT

by the 3 global variables I guess
dont you ever sleep btw?

Re: Lamp Color

Dwight — Fri, 05 Nov 2004 10:22:52 GMT

I am awake through caffeine and desperation. AAAAARGH.

Took on this animation project because I was greedy and I am eating the black bird raw with feathers because I am such an idiot and am making stupid mistakes that eat time. Trying to pay for the 30" cinema display with one "simple" job. AAAAAAAARGH.

Never mind obsequious approach to difficult client who changes mind on a whim, not that I am alone on this forum with such people. I imagine the suave method our AA uses with his clients. AAAAARGH.

For instance - just blew twelve hours worth of animation [not that it was "work" thanks to the dual G5] by trying to save on render time by turning anti-aliasing and method down to just over basic. Granite counter tops and persian carpets all sparkly and dancing. AAAAAARGH.

I am a napper. Anytime.

PS: You are playing the steel guitar - Is it "Sweet Lailani" or "Yer Cheatin' Heart?" Just to see if you are Hawaiian or Country [have to be careful with the spelling of that word - Could get censored like I was talking about Emmy Lou Harris or something.]

Re: Lamp Color

Aussie John — Fri, 05 Nov 2004 11:35:57 GMT

More of a banjo dobro kinda gut these days and in the country camp

Re: Lamp Color

Aussie John — Fri, 05 Nov 2004 11:37:40 GMT

yes doesnt seem to matter how many times one renders a scene there is something not quite right

Re: Lamp Color

David Maudlin — Fri, 05 Nov 2004 13:07:17 GMT

dwight wrote:

How does the GDL lamp obtain its color from the color sampler wheel? I don't see anything in the script that makes the reference......

Dwight:

I had created some lights years ago, to get an understanding of how lights worked in ArchiCAD. For typical lights, it is the first 3 parameters of the LIGHT command that control the color. I took a brief look at the SunObject and the GDL Reference Guide, and see that additional parameters can be added to the LIGHT command for the LightWorks rendering engine. From the GDL Reference Guide:

LIGHT red, green, blue, shadow,
radius, alpha, beta, angle_falloff,
distance1, distance2,
distance_falloff [ ADDITIONAL_DATA name1 = value1,
name2 = value2, ...]

The Sun Object is using the Additional_Data to get the light color values. From the SunObject:

light 0, 0, 0, ! RGB
0, ! shadow on/off
100, ! light cone radius
0,0, ! cone angle inner - outer
0, ! angle falloff
0,100, ! light start - stop
0 ADDITIONAL_DATA lwa_light = "LWA_LIdistant",
LWA_LIdistant_color = sunRGB,
LWA_LIdistant_colortemp = 6500,
LWA_LIdistant_intensity = Intensity,
LWA_LIdistant_intensityunits = "LWA_empirical",
LWA_LIdistant_location = lightLocation,
LWA_LIdistant_to = lightTo,
LWA_LIdistant_shadowtype = "LWA_hard",
LWA_LIdistant_shadows = gs_lwa_cast_shadows,
LWA_LIdistant_shadowtrans = 1,
LWA_LIdistant_scattering = 0

So it looks like the "LWA_LIdistant_color" is the parameter for light color. HTH.
David

Re: Lamp Color

Karl Ottenstein — Fri, 05 Nov 2004 18:18:31 GMT

Dwight wrote:
How does the GDL lamp obtain its color from the color sampler wheel? I don't see anything in the script that makes the reference......

The RGB values of the color picker in a lamp object settings dialog are put into the D, E, G parameters. For these, and the LW parameters, see:

http://www.graphisoft.com/support/developer/documentation/wide/LibraryDevKit/Lamp/Lamp.html

Given the LW params in the above doc, find their meanings/types (via search/find) in:
http://www.graphisoft.com/support/developer/documentation/wide/LibraryDevKit/LightWorksIntegration/LW_Parameters.html

An overview of defining LW lamps etc is in:
http://www.graphisoft.com/support/developer/documentation/wide/LibraryDevKit/LightWorksIntegration/LW_in_GDL.html

In particular, if passing an RGB value as a LW parameter note the following (an array is needed to hold the RGB values):

Passing color and point parameters
When adding a color or a point parameter to a lightsource, you have to create an array as you see it in the following contracted example:

DIM colorRGB[3]
colorRGB[1] = D
colorRGB[2] = E
colorRGB[3] = F

light D * G/80, E * G/80, F * G/80,
...
distFalloff ADDITIONAL_DATA lwa_light = "LWA_LIgsspot",
...
LWA_LIgsspot_color = colorRGB,
...

Good luck, buddy!

Karl