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Revision c6ea3680

Added by Leszek Koltunski about 9 years ago

Correct one issue with incorrect shadows in WAVE when V.z <0 .

View differences:

src/main/res/raw/main_vertex_shader.glsl
374 374 
// Then it can be shown that the resulting surface, at point to which point (x0,y0,0) got moved to,
375 375 
// has 2 tangent vectors given by
376 376 
//
377 
// SX = (1.0+cosX*fx , cosY*sinX*fx , sinY*sinX*fx);  (**)
378 
// SY = (cosX*sinY*fy , 1.0+cosY*fy , sinX*sinY*fy);  (***)
377 
// SX = (1.0+cosX*fx , cosY*sinX*fx , |sinY|*sinX*fx);  (**)
378 
// SY = (cosX*sinY*fy , 1.0+cosY*fy , |sinX|*sinY*fy);  (***)
379 379 
//
380 380 
// and then obviously the normal N is given by N= SX x SY .
381 381 
//
......
391 391 
//    - crosses plane XY along line parallel to X axis
392 392 
// c) apply the 2D analogon and notice that the tangent vector to the curve that is the common part of P
393 393 
//    and our surface (I am talking about the tangent vector which belongs to P) is given by
394 
//    (1+cosX*fx,0,sinX*fx) rotated by angle Y (where angles X,Y are defined above) along vector (1,0,0).
394 
//    (1+cosX*fx,0,sinX*fx) rotated by angle (90-|Y|) (where angles X,Y are defined above) along vector (1,0,0).
395 
//
396 
//    Matrix of rotation:
397 
//
398 
//    |sinY|  cosY
399 
//    -cosY  |sinY|
400 
//
395 401 
// d) compute the above and see that this is equal precisely to SX from (**).
396 402 
// e) repeat points b,c,d in direction Y and come up with (***).
397 403 

  		




  ......




  426
  432
  
    
      float sinY = ( sqrtX==0.0 ? 0.0 : dir.z / sqrtX);


  		




  427
  433
  
    
      float cosY = ( sqrtX==0.0 ? 1.0 : dir.y / sqrtX);


  		




  428
  434
  
    

  		




  
  435
  
    
      float absSinX = sinX<0.0 ? -sinX:sinX;


  		




  
  436
  
    
      float absSinY = sinY<0.0 ? -sinY:sinY;


  		




  
  437
  
    

  		




  429
  438
  
    
      float tmp = 1.578*cos(angle)*deg/length;


  		




  430
  439
  
    

  		




  431
  440
  
    
      float fx = cosB*tmp;


  		




  432
  441
  
    
      float fy = sinB*tmp;


  		




  433
  442
  
    

  		




  434
  
  
    
      vec3 sx = vec3 (1.0+cosX*fx,cosY*sinX*fx,sinY*sinX*fx);


  		




  435
  
  
    
      vec3 sy = vec3 (cosX*sinY*fy,1.0+cosY*fy,sinX*sinY*fy);


  		




  
  443
  
    
      vec3 sx = vec3 (1.0+cosX*fx,cosY*sinX*fx,absSinY*sinX*fx);


  		




  
  444
  
    
      vec3 sy = vec3 (cosX*sinY*fy,1.0+cosY*fy,absSinX*sinY*fy);


  		




  436
  445
  
    

  		




  437
  446
  
    
      vec3 normal = cross(sx,sy);


  		




  438
  447
  
    

  		












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