Gordon Tomlinson (gordon++at++apollo13.demon.co.uk)
Thu, 16 Apr 1998 08:25:18 GMT
What's the geometry you are trying to illuminate?
if the cone is falling within a polygon you will not
see an effect, you need quite afine mesh if it is
a floor/wall etc ...
TTFN
>
>Dear Performers:
>
> I use perfly source codes to test function of SpotLight.
>I set tod=0(time of day)and add a second light by "perfly
>-l 0,0,1000,1,1,1 town.flt"
>
> Or so I change the source code:
>
> {
> pfLightSource *lamp = pfNewLSource();
>
> pfLSourcePos(lamp,
> ViewState->lampXYZ[i][0], /* = 0 */
> ViewState->lampXYZ[i][1], /* = 0 */
> ViewState->lampXYZ[i][2], /* = 1000 */
> 1.0f); /* I change infinite light to local light here*/
>
> /* I add the following two lines for spotlight */
> pfSpotLSourceDir(lamp, 0.0f, 0.0f, -1.0f);
> pfSpotLSourceCone(lamp, 1.0f, 15.0f);
>
> /* set light source color */
> pfLSourceColor(lamp,PFLT_DIFFUSE,
> ViewState->lampRGB[i][0] /* =1 */,
> ViewState->lampRGB[i][1], /* =1 */
> ViewState->lampRGB[i][2]); /* =1 */
>
> pfLSourceOn(lamp);
>
> /* add lamp to scene */
> pfAddChild(scene, lamp);
> }
>
> but it did not have any spotlight effect. Did I do anything wrong?
> Should the spotlight be local light?
>
> Thank you for your answer.
>
>
>Sam Chu
>National Center for High-Performance Computing
>Scientific Visualization Lab Email: c00chu00++at++nchc.gov.tw
>Tel: (886)35-776085 Ext 248 Fax : (886)35-773538
>=======================================================================
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Gordon Tomlinson
System Manager
PERA VR
Technology Centre
Nottingham Road
Melton Mowbray
Leicestershire
LE13 0PB
U.K.
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