opengl的添加多个点光源的例子

s2unn 2017-05-29 03:15:50

renderscene这个函数里我想画两个点光源分别绕x轴和y轴做旋转，但光源2虽然有旋转但是无法出现光照效果请问有人知道是怎么回事吗？是否会出现两个光源互相影响的情况呢？因为无论单独添加哪一个都不会出现问题



GLfloat  specular[] = { 1.0f, 1.0f, 1.0f, 1.0f};

GLfloat  specref[] =  { 1.0f, 1.0f, 1.0f, 1.0f };

GLfloat  ambientLight[] = { 0.5f, 0.5f, 0.5f, 1.0f};

GLfloat  spotDir[] = { 0.0f, 0.0f, -1.0f };

GLfloat light_position[4] = {0.0f, 0.0f, 70.0f, 1.0f};   

GLfloat light_position2[4] = {0.0f, 70.0f, 0.0f, 1.0f};

GLfloat  spotDir2[] = { 0.0f, -1.0f, 0.0f };

void RenderScene(void)

{

    // Clear the window with current clearing color

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    // Save the matrix state

	glColor3f(1.0,1.0,0.0);

	glLoadIdentity();

	glPushMatrix(); 

	glRotatef(xRot, 1, 0, 0);    //光源的旋转

	glLightfv(GL_LIGHT0, GL_POSITION, light_position);

	glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, spotDir);

	glTranslatef(light_position[0], light_position[1],light_position[2]);    //光源位置

	glPushAttrib(GL_LIGHTING_BIT);

	glDisable(GL_LIGHTING);

	glutSolidSphere(5,20,20);//画球作为光源

	glPopAttrib();

	glPopMatrix(); 

	  

	glPushMatrix(); 

	glRotatef(yRot, 0, 1, 0);    //光源的旋转

	glLightfv(GL_LIGHT0, GL_POSITION, light_position2);	

	glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, spotDir2);	

	glTranslatef(light_position2[0], light_position2[1],light_position2[2]);  //光源位置

	glPushAttrib(GL_LIGHTING_BIT);

	glDisable(GL_LIGHTING);

	glutSolidSphere(5,20,20); 

	glPopAttrib();

	glPopMatrix();        //光源设置完毕

 

	

	

	//画球

	glPushMatrix(); 

	glColor3ub(0,255,0);

	glutSolidSphere(10,20,20);

	glTranslatef(-50.0f ,0 ,0);

	glColor3ub(64,64,64);

	glutSolidSphere(10,20,20);

	glTranslatef(100.0f ,0 ,0.0f);

	glColor3ub(255,0,0);

	glutSolidSphere(10,20,20);

    glPopMatrix();

    glutSwapBuffers();// Display the results

}

void SetupRC()

    {

	glEnable(GL_DEPTH_TEST);	// Hidden surface removal

    glFrontFace(GL_CCW);		// Counter clock-wise polygons face out

    glEnable(GL_CULL_FACE);		// Do not try to display the back sides



    // Enable lighting

    glEnable(GL_LIGHTING);



    // Setup and enable light 0

    // Supply a slight ambient light so the objects can be seen

    glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambientLight);

	

    // The light is composed of just a diffuse and specular components

    glLightfv(GL_LIGHT0,GL_DIFFUSE,ambientLight);

    glLightfv(GL_LIGHT0,GL_SPECULAR,specular);

	glLightfv(GL_LIGHT0,GL_POSITION,light_position);



    // Specific spot effects

    // Cut off angle is 60 degrees

    glLightf(GL_LIGHT0,GL_SPOT_CUTOFF,50.0f);



    // Enable this light in particular

    glEnable(GL_LIGHT0);



    // Enable color tracking

    glEnable(GL_COLOR_MATERIAL);

	

    // Set Material properties to follow glColor values

    glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);



    // All materials hereafter have full specular reflectivity

    // with a high shine

    glMaterialfv(GL_FRONT, GL_SPECULAR,specref);

    glMateriali(GL_FRONT, GL_SHININESS,128);





    // Black background

    glClearColor(1.0f, 1.0f, 1.0f, 1.0f );



}