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Betreff des Beitrags: Ripples

Verfasst: Fr Jul 30, 2004 17:18

DGL Member

Registriert: Mi Jul 21, 2004 22:39
Beiträge: 360
Wohnort: UK, Scotland

I tryed to implement the ripple effect from Vereshagin Roman Vladimirovich's Q3 BSP Loader, eventualy i got it working, but there is a odd sideeffect from the blending. Fig 1 shows how it should look(strangly it works fine when looking at it from one direction) and Fig 2 shows the screwup. If im correct 2 parts of the "water" are being added together to make a less transparent area. My question is does anyone know a way to stop this. (without resorting to no transparency).

Render Code:

Code:

 
  glColor4f(1, 1, 1,1);
  glEnable(GL_BLEND);
  glBlendFunc(GL_SRC_COLOR, GL_ONE);
//  glDepthMask(false);
  glActiveTextureARB(GL_TEXTURE0_ARB);
{  glEnable(GL_TEXTURE_GEN_S);
  glEnable(GL_TEXTURE_GEN_T);}
  glEnable(GL_TEXTURE_2D);                // Turn on texture mapping and bind the face's texture map
  glBindTexture(GL_TEXTURE_2D, 4{WaterTexture});
 
  glActiveTextureARB(GL_TEXTURE1_ARB);
  glEnable(GL_TEXTURE_2D);
  glBindTexture(GL_TEXTURE_2D, 0);
  For J :=0 to GridSize-1 do
  begin
    glBegin(GL_QUAD_STRIP);
      for I :=0 to GridSize do
      begin
        glNormal3fv(@RealWater[NWater].Normals[I, J+1]);
        glTexCoord2f((I/GridSize), ((J+1)/GridSize));
        glVertex3fv(@RealWater[NWater].Vertex[I, J+1]);
        glNormal3fv(@RealWater[NWater].Normals[I, J]);
        glTexCoord2f((I/GridSize), (J/GridSize));
        glVertex3fv(@RealWater[NWater].Vertex[I, J]);
      end;
    glEnd;
  end;
 // RealWater[NWater].ElapsedTime2 := ElapsedTime;
 
  glColor4f(1, 1, 1, 1);
  glDisable(GL_BLEND);
//  glDepthMask(true);
  glActiveTextureARB(GL_TEXTURE0_ARB);
{  glDisable(GL_TEXTURE_GEN_S);
  glDisable(GL_TEXTURE_GEN_T);  }
 

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Dateikommentar: Fig2

Ripples2.jpg [126.69 KiB]
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Dateikommentar: Fig1

Ripples1.jpg [131.52 KiB]
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_________________
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-Stu

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Betreff des Beitrags:

Verfasst: Fr Jul 30, 2004 20:07

DGL Member

Registriert: Mi Jul 21, 2004 22:39
Beiträge: 360
Wohnort: UK, Scotland

Iv managed to make it so particles can create ripples on the water, but i still can't figure out a solution to the blending bug.

Dateianhänge:

Ripples3.jpg [164.2 KiB]
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-Stu

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Stucuk

Betreff des Beitrags:

Verfasst: Sa Jul 31, 2004 01:12

DGL Member

Registriert: Mi Jul 21, 2004 22:39
Beiträge: 360
Wohnort: UK, Scotland

Well i "fixed" it, rearly its more of a "trick".

Code:

 
  glDisable(GL_CULL_FACE);
  glEnable(GL_ALPHA_TEST);
  glEnable(GL_BLEND);
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  glColor4f(1, 1, 1, 0.9);
  glActiveTextureARB(GL_TEXTURE0_ARB);
 
  glEnable(GL_TEXTURE_2D);                // Turn on texture mapping and bind the face's texture map
  glBindTexture(GL_TEXTURE_2D, 6{WaterTexture});
 
  glActiveTextureARB(GL_TEXTURE1_ARB);
  glEnable(GL_TEXTURE_2D);
  glBindTexture(GL_TEXTURE_2D, 0);
  For J :=0 to GridSize-1 do
  begin
    glBegin(GL_QUAD_STRIP);
      for I :=0 to GridSize do
      begin
        glNormal3fv(@RealWater[NWater].Normals[I, J+1]);
        glTexCoord2f((I/GridSize), ((J+1)/GridSize));
        glVertex3fv(@RealWater[NWater].Vertex[I, J+1]);
        glNormal3fv(@RealWater[NWater].Normals[I, J]);
        glTexCoord2f((I/GridSize), (J/GridSize));
        glVertex3fv(@RealWater[NWater].Vertex[I, J]);
      end;
    glEnd;
  end;
 
  glColor4f(1, 1, 1, 1);
  glDisable(GL_BLEND);
  glActiveTextureARB(GL_TEXTURE0_ARB);
 

With blend set to Alpha the colours alpha comes into effect. With a value of 0.9 there is no noticable "addition" between transparent parts of the water(because its hardly transparent but transparent enough to see objects through it)

_________________
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Sascha Willems

Betreff des Beitrags:

Verfasst: Sa Jul 31, 2004 09:53

DGL Member

Registriert: Mo Sep 23, 2002 19:27
Beiträge: 5812
Programmiersprache: C++

You said that two parts of the water are drawn over each other. If that's the case, can't you use multitexturing? That would eliminate all the problems that occure if you use blending and multipass.

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Betreff des Beitrags:

Verfasst: Sa Jul 31, 2004 10:39

DGL Member

Registriert: Mi Jul 21, 2004 22:39
Beiträge: 360
Wohnort: UK, Scotland

well 2 parts arn't drawn exactly over each other but sometimes depending on view parts become under other parts depth wise(due to ripples) and blending seems to make the parts colour "add" when the alpha is low.

_________________
Free Map Editor - Game Requirements - Stucuk.Net
-Stu

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