Hi,
I did the second way as you mentioned, i think for direction light beacon does
not matter if we don't want to move the directional light. If i don't add
directional light transform nodes in the root node but still i can see the
geometry, How is it possible?.
Does directional light has special implementation technique?
Even i changed the direction vector of the lights to 1,0,1 instead of 0,1,1.
The illumination effect does not change.
Reducing the number of light to one. Then also illumination effect does not
change? why it is so?
I have made the "room" geometry in the Maya and exported in vrml format for
using in OpenSG.
See the codes which i wrote.
// d1Light Atrributes
beginEditCP(d1Light);
d1Light->setDirection (Vec3f(0,1,1));
//d1Light->setBeacon(d1LightTransformNode);
endEditCP(d1Light);
// d2Light Attributes
beginEditCP(d2Light);
d2Light->setDirection (Vec3f(0,1,1));
//d1Light->setBeacon(d2LightTransformNode);
endEditCP(d2Light);
//d3Light Attributes
beginEditCP(d3Light);
d3Light->setDirection (Vec3f(0,1,1));
//d1Light->setBeacon(d3LightTransformNode);
endEditCP(d3Light);
// Set core for d1LightTransformNode
beginEditCP(d1LightTransformNode);
d1LightTransformNode->setCore(d1LightTransformCore);
endEditCP(d1LightTransformNode);
// Set core for d2LightTransformNode
beginEditCP(d2LightTransformNode);
d2LightTransformNode->setCore(d2LightTransformCore);
endEditCP(d2LightTransformNode);
//Set core for d3LightTransformNode
beginEditCP(d3LightTransformNode);
d3LightTransformNode->setCore(d3LightTransformCore);
endEditCP(d3LightTransformNode);
// Main root node
beginEditCP(root);
root->setCore(g);// Setting core
root->addChild(room);
//root->addChild(d1LightTransformNode);
//root->addChild(d2LightTransformNode);
//root->addChild(d3LightTransformNode);
endEditCP(root);
Best Regards
Brajesh Lal
----- Original Message ----
From: Carsten Neumann <[EMAIL PROTECTED]>
To: [email protected]
Sent: Saturday, June 16, 2007 12:56:47 PM
Subject: Re: [Opensg-users] Lighting a geometry by muliple lights
Hello Brajesh,
Brajesh Lal wrote:
> Hi,
>
> I am trying real time Image based lighting concept in OpenSG. I have
> corresponding approximated number of directional lights generated from the
> HDR Image using HDRShop. I have all lights position and direction info. I
> want to illuminate the model with these directional lights.
> I want to lit a geometry ( say "room") by 3 lights. This geometry is having
> big glass through which lights should come from outside
> What i did is
> 1. Made a root for scene ( say " root")
> 2. Added empty group node ( say "g") as a core of root node and a
> directional light (d3) as a child of root node
> 4. d3 is having a its transform core and a direction light (d2) as child.
> 5. d2 is having a its transform core and a directional light (d1) as child
> 6. d1 is having a its transform core and a room as child
> All directional light are placed at 0,0,0 and direction is 0,1,1. These
> lights represent Default light (Headlight) is set to false.
a lights position in the scenegraph only determines the part of the
scene affected (lit) by that light. The light's position in the scene is
determined through the its beacon node. From your description I guess
you want a scene like this:
root
| [Group]
|
Light_1
| [Dir.Light]
|
L1_Beacon
| [Transform]
|
Light_2
| [Dir.Light]
|
L2_Beacon
| [Transform]
|
Light_3
| [Dir.Light]
|
L3_Beacon
| [Transform]
|
room
[Geometry]
This means that room is lit by Light_1, Light_2, Light_3 and by setting
each lights beacon field to the corresponding Node L?_Beacon you can
place the lights in the scene. Note that in this setup, moving a light
also moves all lights below it and the room. To be able to move the
lights independently you could use something like:
root
| [Group]
+-------------+--------------+--------------+
| | | |
Light_1 L1_Beacon L2_Beacon L3_Beacon
| [Dir.Light] [Transform] [Transform] [Transform]
|
Light_2
| [Dir.Light]
|
Light_3
| [Dir.Light]
|
room
[Geometry]
Hope it helps,
Carsten
> I am not able to see the change in the illumination if i add or delete more
> lights. What wrong i am doing
>
> Here is the code
>
> // Setting first Light
>
> beginEditCP(d1LightTransformNode);
> d1LightTransformNode->setCore(d1LightTransform);
> d1LightTransformNode->addChild(room);
> endEditCP(d1LightTransformNode);
>
> // Setting core and child of the second light of the
>
> beginEditCP(d2LightTransformNode);
> d2LightTransformNode->setCore(d2LightTransform);
> d2LightTransformNode->addChild(d1LightTransformNode);
> endEditCP(d2LightTransformNode);
>
> // Setting thrid light
> beginEditCP(d3LightTransformNode);
> d3LightTransformNode->setCore(d3LightTransform);
> d3LightTransformNode->addChild(d2LightTransformNode);
> endEditCP(d3LightTransformNode);
>
> // Main root node
> beginEditCP(root);
> root->setCore(g);// Setting core
> root->addChild(d3LightTransformNode);// adding group of lights
> endEditCP(root);
>
> Best Regards
> Brajesh Lal
>
>
>
>
>
>
>
>
>
>
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