3D Anaglyph implementation demo

1. Joshua Smith and Garrick Solberg CSS 552 – Topics in Rendering 3D Anaglyph implementation demo

2. Project Goal • Implement stereoscopic “3D” via anaglyph rendering • Depth is achieved by ray tracing from two camera positions. Each position records different color channels, resulting in two images superimposed upon each other • Brain is tricked into seeing one image and perceiving depth via color filters that block an image for each eye

3. RT3DCamera public class RT3DCamera : RTCamera{ protected Vector3 leftCamera, rightCamera; public RT3DCamera(CommandFileParser parser, SceneDatabasesceneDB) : base(parser) { computeCameraPositions(sceneDB); } public void computeCameraPositions(SceneDatabasesceneDB) { … for (int i = 0; i < sceneDB.GetNumGeom(); i++){ RTGeometryg = sceneDB.GetGeom(i); maxDist= (mEye - g.Max).Length(); minDist= (mEye - g.Min).Length(); if (maxDist < minDist) curDist= maxDist; else curDist= minDist; if (curDist < shortestDist) shortestDist= curDist; }// end for float eyeSeparation = shortestDist / 30; leftCamera= mEye + mSideVec * eyeSeparation / 2; rightCamera= mEye - mSideVec * eyeSeparation / 2; } // end class

4. RTCore_Compute : ComputeImage … for (inti = 0; i < mImagespec.NumSamplesPerPixel; i++) { … if (!mAnaglyph) { computePixelColor(r, refpixelColor, SINGLE); } else { Ray left = new Ray(mCamera.LeftEyePosition, pixelPos); computePixelColor(left, refpixelColor, LEFT); Ray right = new Ray(mCamera.RightEyePosition, pixelPos); computePixelColor(right, refpixelColor, RIGHT); } …

5. RTCore_Compute : ComputePixelColor privatevoidComputePixelColor(Ray r, ref Vector3 pixelColor, int channel)         { IntersectionRecord rec = newIntersectionRecord(); // what can we see? ComputeVisibility(r, rec, RTCore.kInvalidIndex);             Vector3 sampleColor = mBgColor; // what color should it be? if (rec.GeomIndex != RTCore.kInvalidIndex) sampleColor = ComputeShading(rec, 0); if(channel == SINGLE) pixelColor+= sampleColor; elseif (channel == LEFT) pixelColor+= sampleColor * leftLens; elseif (channel == RIGHT) pixelColor+= sampleColor * rightLens;         }

6. RTCore_Compute : SetFilters private void SetFilters() { if (mAnaglyphList == Anaglyph.No3D) { leftLens = new Vector3(1, 1, 1); rightLens = leftLens; mAnaglyph = false; } else{ if (mAnaglyphList == Anaglyph.RedGreen) { leftLens = new Vector3(1, 0, 0); rightLens = new Vector3(0, 1, 0); } else if (mAnaglyphList == Anaglyph.RedCyan) { leftLens = new Vector3(1, 0, 0); rightLens = new Vector3(0, 1, 1); } else if (mAnaglyphList == Anaglyph.GreenMagenta) { leftLens = new Vector3(0, 1, 0); rightLens = new Vector3(1, 0, 1); … } mAnaglyph = true; } }