求助:my shadowmap

jzpijiang81_37

最近想用soft_edged介绍的方法做软阴影,首先我实现了深度图的拷贝,在用glsl实现PCF的shadowmap时,只能得到最后画的一个物体,不仅没有阴影,连物体色彩也没有,并且场景是黑色的
下面是我的GLSL代码:
..vertex shader
niform mat4 texturematrix;

varying vec4 projcood;
uniform vec4 lightpos;
varying float diffuse ;

void main()
{
projcood=texturematrix*gl_Vertex;
  
  vec4 pos = gl_ModelViewMatrix * gl_Vertex;
  
  vec3 n = gl_NormalMatrix * gl_Normal;
  
  vec3 lightvect = normalize(lightpos.xyz - pos.xyz);
  
  diffuse= max(dot(lightvect,n ), 0.0);
  
  gl_Position =ftransform();
}
//frgment shader

uniform  sampler2DShadow shadowmap;
varying vec4 projcood;
uniform float size;
uniform vec4 lightcolor;
varying float diffuse ;
uniform vec4 ambient;


void main()
{
  vec4 vtexcoord[9];
  float  shadowcolor[9];
  float texsize=1.0/size;
  vec4  color;
  

  float  factorshadow;
  vec4 xolor;
  vec4 projcood1;
//4  3  5
//1  0  2
//7  6  8   
// projcood1=projcood/projcood.w;  

               

  vtexcoord[0]=projcood;
  vtexcoord[1]=projcood+vec4(-texsize,0.0,0.0,0.0);
  vtexcoord[2]=projcood+vec4(texsize,0.0,0.0,0.0);
  vtexcoord[3]=projcood+vec4(0.0,-texsize,0.0,0.0);
  vtexcoord[6]=projcood+vec4(0.0,texsize,0.0,0.0);
  vtexcoord[4]=projcood+vec4(-texsize,-texsize,0.0,0.0);
  vtexcoord[7]=projcood+vec4(-texsize,texsize,0.0,0.0);
  
  vtexcoord[5]=projcood+vec4(texsize,-texsize,0.0,0.0);
  vtexcoord[8]=projcood+vec4(texsize,texsize,0.0,0.0);

  if(projcood.q< 0.0)
  {
     factorshadow=1.0;
  }
  else
  {
      for(int i=0;i<9;i++ )
      {
   
         shadowcolor=shadow2DProj(shadowmap, vtexcoord).r;
         factorshadow=factorshadow+shadowcolor;
      }
   
   
    factorshadow=factorshadow/9.0;
   // xolor=vec4(0.2,0.6,1.0,1.0);

  }


    //gl_FragColor=xolor;
  gl_FragColor=factorshadow*lightcolor*diffuse+ambient;
  
  
}

千里马肝

除了normal在gl_NormalMatrix * gl_Normal后最好normalize一下外
就shader没看出什么问题
应该是上层应用的问题吧