From: Rob Body (r.body++at++hrwallingford.co.uk)
Date: 12/08/2004 09:42:19
Hi everyone,
I am trying to model spotlights in Performer 3.1.1 in either Linux or
Windows. When I make a spotlight in Creator it can be seen illuminating the
scene correctly. When I then run Performer the spotlight is not visible at
all. This used to work correctly on my ONYX RE2 but now doesn't.
I have also tried hard coding a spotlight in a fixed position. This sort of
works as my sea surface is illuminated but the terrain near it is not, even
though the terrain is divided into smallish polygons, some of which are
completely covered by the spot light.
My code for adding the spotlight into Performer is this :
scene = pfNewScene();
arena = pfGetSharedArena();
/* Turn on lighting globally. Disable two-sided lighting. */
lmodel = pfNewLModel(arena);
// the following determines how much light reflects back off object
when it is dark
pfLModelAmbient(lmodel, 0.02f, 0.02f, 0.02f);
pfLModelTwoSide(lmodel, PF_OFF);
gstate = pfNewGState(arena);
pfGStateMode(gstate, PFSTATE_ENLIGHTING, PF_ON);
pfGStateAttr(gstate, PFSTATE_LIGHTMODEL, lmodel);
pfSceneGState(scene, gstate);
/* Load the database. create a hierarchy under node "model" */
terrain_model = pfdLoadFile(databasefilename);
pfAddChild(scene, terrain_model);
// try to add a white flood light at a fixed position, shining
down on the sea for testing
spotlightDCS = pfNewDCS();
spotlight = pfNewLSource();
pfSpotLSourceDir(spotlight, 0, 0, -1);
pfLSourceColor(spotlight, PFLT_DIFFUSE, 1.0f, 1.0f, 1.0f);
pfLSourceColor(spotlight, PFLT_SPECULAR, 1.0f, 1.0f, 1.0f);
pfLSourceColor(spotlight, PFLT_AMBIENT, 1.0f, 1.0f, 1.0f);
pfLSourceVal(spotlight, PFLS_INTENSITY, 1.0f);
pfLSourcePos(spotlight, 660.126f, 750.43f, 27.5f, 1.0f); /* Make
light local */
pfSpotLightCone(spotlight, 1.0f, 1.0f);
pfAddChild(scene, spotlightDCS);
pfAddChild(spotlightDCS, spotlight);
Do I need to do anything else at run time in order for the lighting to work
properly? I have looked at pfLightOn(lightsource) but I don't think that I
need to include this. Am I correct in this?
Any pointers would be appreciated.
Thanks
Rob Body
Simulator Manager
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HR Wallingford Ltd
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Telephone: +44 (0) 1491 822327 Direct (Switchboard 835381)
Fax: +44 (0) 1491 832233
E-mail: r.body++at++hrwallingford.co.uk
Internet: http://www.hrwallingford.co.uk
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