Projective Texture Mapping - Spotlight Flashlight

  
//REPLACE THIS LINE
mat_set(mtlSpotlit.matrix,matViewProj);	  // store the transformation matrix to the material
 
//WITH THIS CODE
float my_matVP[16] = { 0.0, 0.0, 0.0, 0.0, 0.0,0.0,0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
mat_set(my_matVP,matView);
mat_multiply(my_matVP,matProj);
mat_set(mtlSpotlit.matrix,my_matVP);
 

• does the shader work for multiple projectors, too?
• this is a perspective projector.. are you able to make an orthograpic projector as well?

 
    // send my position to shader (vecSkill1.xyzw)
    mtlSpotlit.skill1 = float(my.x);
    mtlSpotlit.skill2 = float(my.z);           // z and y must be reversed!
    mtlSpotlit.skill3 = float(my.y);
    mtlSpotlit.skill4 = float(650);            // spotlights range

    // send my direction to shader (vecSkill2.xyzw)
    vec_for_angle(temp_vec.x, vector((my.pan), my.tilt, my.roll)); //turn my angles into a dir vector
    mtlSpotlit.skill5 = float(temp_vec.x);
    mtlSpotlit.skill6 = float(temp_vec.z);     // z and y must be reversed!
    mtlSpotlit.skill7 = float(temp_vec.y);
 

 
my.material = mtlSpotlit;
 

 
//
// By Joseph Duffey Jan 2008
// For the GameStudio Community
//
// Converted to WDL format by Reigel Seven 2008
//
// Example 1: Projective Texturing Spotlight with specular

//=======================================================================================
// VARIABLES
//=======================================================================================

var temp_vec[3];  // for temporary vectors
FONT standard_font = "Arial",1,14; 

var pTexAdj[16];

//=======================================================================================
// CAMERA ACTION
//=======================================================================================

action Spectator()
{
	//set(me,INVISIBLE | PASSABLE);
	my.invisible = on;
	my.passable = on;
	
//	while(!player)
//	{
//		wait(1);
//	}
	vec_set(camera.x, my.x);
	
	while(me)
	{
		vec_set(temp_vec,player.x); 
		vec_sub(temp_vec,camera.x);
		vec_to_angle(camera.pan,temp_vec); 
		wait(1);
	}	
}

//=======================================================================================
// MATERIAL FOR OBJECTS LIT BY SPOTLIGHT
//=======================================================================================

MATERIAL mtlSpotlit
{
	ambient_red = 12;		                // The ambient color - a dark grey.
  ambient_green = 10;
  ambient_blue = 8;
  effect = "PP_Spot.fx";	                // The effect file containing the vertex shader, pixel shader and technique.
}

//=======================================================================================
// SPOTLIGHT CODE
//=======================================================================================

action Spotlight()
{
  //player = me;
  while(1)
  {
    // move me with keyboard keys
//    c_move(me, vector((key_w - key_s)*time_step*8,0,0), nullvector, IGNORE_PASSABLE | GLIDE);
//    c_rotate(me, vector((key_cul-key_cur)*time_step*8, (key_cuu-key_cud)*time_step*8,0), IGNORE_PASSABLE );
  
    // send my position to shader (vecSkill1.xyzw)
    mtlSpotlit.skill1 = float(my.x);
    mtlSpotlit.skill2 = float(my.z);           // z and y must be reversed!
    mtlSpotlit.skill3 = float(my.y);
    mtlSpotlit.skill4 = float(650);            // spotlights range

    // send my direction to shader (vecSkill2.xyzw)
    vec_for_angle(temp_vec.x, vector((my.pan), my.tilt, my.roll)); //turn my angles into a dir vector
    mtlSpotlit.skill5 = float(temp_vec.x);
    mtlSpotlit.skill6 = float(temp_vec.z);     // z and y must be reversed!
    mtlSpotlit.skill7 = float(temp_vec.y);

    wait(1);
  }
}

//=======================================================================================
// ACTION FOR OBJECTS LIT BY SPOTLIGHT
//=======================================================================================

action Spotlit_object()
{
  my.material = mtlSpotlit;
}
 

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what would be a good addition for realistic purpose:

get the dot product of the model normal and the normal from vertex to cam position and then use it with the "alpha" of the projection. So that only faces facing the light get lighted.

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in the meantime im wondering, how can i change the colour of the shadow pixel?

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