mikiex's Forum Posts

• • mikiex
  • 
  • • Joined 11 May, 2008
    • 
    • 2 topics • 4 posts
  • 1

  • 6 Jun, 2008
  • Quote

  You're welcome to do what you want with it

  I wish I had more time to improve it, but I thought I would post it rather than just leave it sitting on my pc doing nothing.

  You might be interested in : http://accad.osu.edu/~smay/RManNotes/RegularPatterns/index.html

  Its a page about regular patterns using Renderman shaders but they are very similar to HLSL.

  Construct is cool btw

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• • mikiex
  • 
  • • Joined 11 May, 2008
    • 
    • 2 topics • 4 posts
  • 1

  • 5 Jun, 2008
  • Quote

  This is a quick example of how you could use an effect to replace a sprite with a procedual texture, this fx file makes a circle. This is unfinished in as much as it could be made to do things such as having a consistant line width, allow custom colours etc.

  Hope someone finds it useful

  // AMS_Circle
  // Mikiex
  // PS 2.0
  // Circle Maker Example.
  
  //#CROSS-SAMPLING : changes Tex.xy.
  //#PARAM float Cwidth 0.1 : Circle line width : Circle line width.
  //#PARAM float edgefuzz 0.01 : edgefuzz : Fuzzyness of the edges.
  
  // Parameter variables
  float Cwidth;
  float edgefuzz;
  
  // Foreground texture
  texture ForegroundTexture;
  
  // Foreground sampler
  sampler2D foreground = sampler_state {
      Texture = (ForegroundTexture);
      MinFilter = Linear;
      MagFilter = Linear;
      MipFilter = Linear;
  };
  
  // Increments 1 per frame
  float frameCounter;
  
  //These are all constants from Construct
  float boxLeft;
  float boxRight;
  float boxTop;
  float boxBottom;
  float pixelWidth;
  float pixelHeight;
  float hotspotX;
  float hotspotY;
  float boxWidth;
  float boxHeight;
  float angle;
  
  // Effect function
  float4 EffectProcess( float2 Tex : TEXCOORD0 ) : COLOR0
  {
  
  //    float4 jj = tex2D(foreground, Tex.xy); //we just ignore the original image
  	float tx = (Tex.x-boxLeft)/boxWidth; // make the box into U coords from 0 to 1
  	float ty = (Tex.y-boxTop)/boxHeight; // make the box into V coords from 0 to 1
  	float res = distance(0.5,float2(tx,ty)); // Use the distance function to create what looks like a radial gradient
  	float xfuzz = boxWidth*edgefuzz; // how fuzzy do we want the x edges
  	float yfuzz = boxHeight*edgefuzz; // how fuzzy do we want the y edges
  	
  	float SS1 = 0.5; // this sets the smoothstep position
  	float SS2 = 0.5-Cwidth; // this is the inside smoothstep position
  	
  	res = smoothstep(SS1,SS1-xfuzz,res)*smoothstep(SS2-yfuzz,SS2,res); // the magic of smoothstep!
   
    	
    	float4 resr = {res,0,0,res}; // we pass the result to just the red channel and the alpha channel
  
      return resr;
  }
  
  // ConstructEffect
  technique ConstructEffect
  {
      pass p0
      {
          VertexShader = null;
          PixelShader = compile ps_2_0 EffectProcess();
      }
  }[/code:3skzwxbh]
• • mikiex
  • 
  • • Joined 11 May, 2008
    • 
    • 2 topics • 4 posts
  • 1

  • 12 May, 2008
  • Quote

  I think you want the boxLeft/boxTop/boxRight/boxBottom float parameters, which are detailed here.

  I did try this, i noticed these in the source code. But I was getting strange results.

  I'll post a .fx snippet

  The idea I had was to generate a procedual replacement of a sprite.

  You can easy make things like circles etc.

• • mikiex
  • 
  • • Joined 11 May, 2008
    • 
    • 2 topics • 4 posts
  • 1

  • 11 May, 2008
  • Quote

  Hi,

  I like how construct is going, but I have a question - how would I match an effects (in and FX file) UV's so they match the box around the sprite. So I want to get the world coords from the corners of the box into the shader.

  Mhmhm did I explain that bad?