On 9/5/06, Yigang Wang <[EMAIL PROTECTED]> wrote:
If the relative case you can use the osg::Node method:
/** Get the list of matrices that transform this node from local coordinates to world coordinates.
* The optional Node* haltTraversalAtNode allows the user to prevent traversal beyond a specifed node. */
MatrixList getWorldMatrices(osg::Node* haltTraversalAtNode=0) const;
I want to get the light position of osg::Lightsource. However, I donot know in what coordinate system the position defines. If I use ABSOLUTE_REF, It seems the position is defined in Eye Coordinate Space. If I use RELATIVE_REF, it just can be looked as a normal node to get the world coordinates ( which root node lies). Is it correct? I need caculate the lighting by myself.
If the relative case you can use the osg::Node method:
/** Get the list of matrices that transform this node from local coordinates to world coordinates.
* The optional Node* haltTraversalAtNode allows the user to prevent traversal beyond a specifed node. */
MatrixList getWorldMatrices(osg::Node* haltTraversalAtNode=0) const;
Another question about directional light. Normally we define glLightPosition( 0, 0, 1, 0) as the head light. Is it defined in Eye coordinate space? the light direction is from (0, 1, 0) to (0, 0, 0)? Is the correct? for every directional light, the direction is from the defined position point to (0, 0, 0).
With lighting when you set the w value to 0, the x,y,z position is effectively the becomes a direction vector, rather than a position as you'd normally think about a (x,y,z,1) coordinate.
Robert.
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