I have a model that should be under a spotlight / directional light,
Meaning, I need to switch between modes (Spotlight and directional).
Here is the code with some explanation:
I can rotate the model / light source with mouse movements, so I use
glRotate and glTranslate for this.
As soon as the user has pressed the "L" key, I have to switch between modes.
here is the code for the zipper:
void LightBall::projectLight(void) { if(LIGHT == _lightMode){ printf("Entering LIGHT mode\n"); <--- Supposed to be a directional light glDisable(GL_LIGHT1); glEnable(GL_LIGHT0); glLightfv(GL_LIGHT0, GL_POSITION, _light_position); } if(SPOT_LIGHT == _lightMode){ printf("Entering SPOTLIGHT mode\n"); <--- Supposed to be a spotlight glDisable(GL_LIGHT0); glEnable(GL_LIGHT1); glLightfv(GL_LIGHT1, GL_POSITION, _light_position); glLightf(GL_LIGHT1, GL_SPOT_CUTOFF, 10.0); glLightf(GL_LIGHT1, GL_SPOT_EXPONENT, 2.0); glLightfv(GL_LIGHT1,GL_SPOT_DIRECTION,_spotlight_position); } }
The problem is that when you switch between them, you always get the same lighting mode,
What it is:
And another example after switching between 2 light modes and the same light beam
source with rotation of the light source (small ball):
How can I get the desired result?
Here are the definitions of LIGHT0 and LIGHT1:
GLfloat light_ambient[] = { 1.0, 0.0, 0.0, 1.0 }; GLfloat light_diffuse[] = { 1.0, 0.0, 0.0, 1.0 }; GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 }; _light_position[0] = 0.0; _light_position[1] = 1.0; _light_position[2] = 0.0; _light_position[3] = 0.0; _spotlight_position[0] = 0.0; _spotlight_position[1] = -1.0; _spotlight_position[2] = 0.0; glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient); glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse); glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular); glLightfv(GL_LIGHT1, GL_AMBIENT, light_ambient); glLightfv(GL_LIGHT1, GL_DIFFUSE, light_diffuse); glLightfv(GL_LIGHT1, GL_SPECULAR, light_specular);
Thanks!