commit 6d020cb659518b10126822389c8fae0f702f1854 Author: Leszek Koltunski Date: Tue Jan 26 10:35:47 2021 +0100 Progress with Megaminx. diff --git a/src/main/java/org/distorted/examples/meshfile/FactoryCubit.java b/src/main/java/org/distorted/examples/meshfile/FactoryCubit.java index 1d1b9cb..c0b2a14 100644 --- a/src/main/java/org/distorted/examples/meshfile/FactoryCubit.java +++ b/src/main/java/org/distorted/examples/meshfile/FactoryCubit.java @@ -47,12 +47,16 @@ class FactoryCubit private static final float REX_D = 0.2f; private static final int REX_N = 5; - static final float MINX_C0 = (SQ5-1)/4; - static final float SIN54 = (SQ5+1)/4; // sin(54 deg) - static final float COS54 = (float)(Math.sqrt(10-2*SQ5)/4); // cos(54 deg) + static final float SIN18 = (SQ5-1)/4; + static final float COS18 = (float)(0.25f*Math.sqrt(10.0f+2.0f*SQ5)); + static final float SIN54 = (SQ5+1)/4; + static final float COS54 = (float)(Math.sqrt(10-2*SQ5)/4); static final float COS_HALFD= (float)(Math.sqrt(0.5f-0.1f*SQ5)); // cos(half the dihedral angle) static final float SIN_HALFD= (float)(Math.sqrt(0.5f+0.1f*SQ5)); // sin(half the dihedral angle) + static final float DIHEDRAL1= (float)(Math.acos(-SQ5/5)*180/Math.PI); + static final float DIHEDRAL2= (float)((180/Math.PI)*Math.asin((2*SIN54*SIN54-1)/COS54) - 90); + private static final Static1D RADIUS = new Static1D(1); private static FactoryCubit mThis; @@ -795,6 +799,45 @@ class FactoryCubit return new MeshJoined(meshes); } +/////////////////////////////////////////////////////////////////////////////////////////////////// + + MeshBase createFacesMegaminxEdge(float width, float height) + { + MeshBase[] meshes = new MeshPolygon[6]; + + float D = height/COS18; + float W = D*SIN18; + + float Y1 = 0.5f*width; + float Y2 = 0.5f*width + W; + float Y3 = 0.5f*width + 2*W; + float X2 = D*SIN54; + float X1 = 0.5f*height; + float Y4 = D*COS54; + + float[] vertices0 = { -X1, Y1, -X1, -Y1, X1, -Y2, X1, Y2 }; + float[] vertices1 = { -X1, Y3, -X1, -Y3, X1, -Y2, X1, Y2 }; + float[] vertices2 = { -X2, 0.0f, 0.0f, -Y4, X2, 0.0f, 0.0f, Y4 }; + + float[] bands0 = computeBands(0.04f,34, X1,0.2f,5); + float[] bands1 = computeBands(0.00f,34,0.3f,0.2f,2); + + meshes[0] = new MeshPolygon(vertices0, bands0, 1, 1); + meshes[0].setEffectAssociation(0, 1,0); + meshes[1] = meshes[0].copy(true); + meshes[1].setEffectAssociation(0, 2,0); + meshes[2] = new MeshPolygon(vertices1, bands1, 1, 4); + meshes[2].setEffectAssociation(0, 4,0); + meshes[3] = meshes[2].copy(true); + meshes[3].setEffectAssociation(0, 8,0); + meshes[4] = new MeshPolygon(vertices2, bands1, 1, 4); + meshes[4].setEffectAssociation(0,16,0); + meshes[5] = meshes[4].copy(true); + meshes[5].setEffectAssociation(0,32,0); + + return new MeshJoined(meshes); + } + /////////////////////////////////////////////////////////////////////////////////////////////////// // EFFECTS /////////////////////////////////////////////////////////////////////////////////////////////////// @@ -1302,8 +1345,8 @@ class FactoryCubit float Y1= (float)(Math.sqrt(2+0.4f*SQ5)/4); float Y2= H/(2*COS_HALFD); float A = (float)(Math.acos(-SQ5/5)*180/Math.PI); // dihedral angle of a dedecahedron in degrees - float sin18 = MINX_C0; - float cos18 = (float)(Math.sqrt(1-MINX_C0*MINX_C0)); + float sin18 = SIN18; + float cos18 = (float)(Math.sqrt(1- SIN18 * SIN18)); float LEN = (float)Math.sqrt(H*H/(COS_HALFD*COS_HALFD) + 0.25f); Static3D axisZ = new Static3D(0.0f , 0.0f , 1.0f); @@ -1352,7 +1395,6 @@ class FactoryCubit VertexEffect[] effect = new VertexEffect[9]; float Y = COS54/(2*SIN54); - float A = (float)(Math.acos(-SQ5/5)*180/Math.PI); // dihedral angle of a dedecahedron in degrees float sinA = (2*SIN54*SIN54-1)/COS54; float cosA = (float)Math.sqrt(1-sinA*sinA); @@ -1368,9 +1410,9 @@ class FactoryCubit Static3D move1= new Static3D(0.0f, -sinA*LEN, -cosA*LEN ); Static3D move2= new Static3D(0.0f, Y , 0.0f ); - Static1D angleD = new Static1D(A); - Static1D angleE = new Static1D(360-A); - Static1D angleF = new Static1D( (float)((180/Math.PI)*Math.asin(sinA) - 90) ); + Static1D angleD = new Static1D(DIHEDRAL1); + Static1D angleE = new Static1D(360-DIHEDRAL1); + Static1D angleF = new Static1D(DIHEDRAL2); effect[0] = new VertexEffectScale ( new Static3D( 1, 1,-1) ); effect[1] = new VertexEffectRotate(angleE, axisA, centerU); @@ -1392,6 +1434,66 @@ class FactoryCubit return effect; } +/////////////////////////////////////////////////////////////////////////////////////////////////// + + VertexEffect[] createVertexEffectsMegaminxEdge(float width, float height) + { + VertexEffect[] effect = new VertexEffect[11]; + + float X = 0.5f*height; + float Y = height*(COS54/COS18) + width*0.5f; + float Z = 2*height*COS_HALFD; + + float alpha = 90-DIHEDRAL1/2; + float beta = DIHEDRAL2; + + Static1D angle1 = new Static1D(alpha); + Static1D angle2 = new Static1D(180-alpha); + Static1D angle3 = new Static1D(beta); + + Static3D move1 = new Static3D(X,0,0); + Static3D move2 = new Static3D(X,0,-Z); + Static3D move3 = new Static3D(0,+Y,0); + Static3D move4 = new Static3D(0,-Y,0); + Static3D scale = new Static3D(+1,+1,-1); + + Static3D axisXplus = new Static3D(+1, 0, 0); + Static3D axisXminus= new Static3D(-1, 0, 0); + Static3D axisYplus = new Static3D( 0,+1, 0); + Static3D axisYminus= new Static3D( 0,-1, 0); + + Static3D center1= new Static3D( 0, 0, 0); + Static3D center2= new Static3D( 0, 0,-Z); + Static3D center3= new Static3D( 0,+width*0.5f, 0); + Static3D center4= new Static3D( 0,-width*0.5f, 0); + + effect[ 0] = new VertexEffectMove(move1); + effect[ 1] = new VertexEffectMove(move2); + effect[ 2] = new VertexEffectMove(move3); + effect[ 3] = new VertexEffectMove(move4); + effect[ 4] = new VertexEffectScale(scale); + effect[ 5] = new VertexEffectRotate(angle1, axisYplus , center1); + effect[ 6] = new VertexEffectRotate(angle2, axisYplus , center1); + effect[ 7] = new VertexEffectRotate(angle1, axisYminus, center2); + effect[ 8] = new VertexEffectRotate(angle2, axisYminus, center2); + effect[ 9] = new VertexEffectRotate(angle3, axisXplus , center3); + effect[10] = new VertexEffectRotate(angle3, axisXminus, center4); + + effect[ 0].setMeshAssociation( 3,-1); // meshes 0,1 + effect[ 1].setMeshAssociation(12,-1); // meshes 2,3 + effect[ 2].setMeshAssociation(16,-1); // mesh 4 + effect[ 3].setMeshAssociation(32,-1); // mesh 5 + effect[ 4].setMeshAssociation( 2,-1); // mesh 1 + effect[ 5].setMeshAssociation( 1,-1); // mesh 0 + effect[ 6].setMeshAssociation( 2,-1); // mesh 1 + effect[ 7].setMeshAssociation( 4,-1); // mesh 2 + effect[ 8].setMeshAssociation( 8,-1); // mesh 3 + effect[ 9].setMeshAssociation(16,-1); // mesh 4 + effect[10].setMeshAssociation(32,-1); // mesh 5 + + return effect; + } + /////////////////////////////////////////////////////////////////////////////////////////////////// // OBJECTS /////////////////////////////////////////////////////////////////////////////////////////////////// @@ -1795,6 +1897,19 @@ class FactoryCubit //mesh.mergeEffComponents(); + return mesh; + } + +/////////////////////////////////////////////////////////////////////////////////////////////////// + + MeshBase createMegaminxEdgeMesh(float width, float height) + { + MeshBase mesh = createFacesMegaminxEdge(width,height); + VertexEffect[] effects = createVertexEffectsMegaminxEdge(width,height); + for( VertexEffect effect : effects ) mesh.apply(effect); + + //mesh.mergeEffComponents(); + return mesh; } } diff --git a/src/main/java/org/distorted/examples/meshfile/MeshFileRenderer.java b/src/main/java/org/distorted/examples/meshfile/MeshFileRenderer.java index 9b256ef..617332a 100644 --- a/src/main/java/org/distorted/examples/meshfile/MeshFileRenderer.java +++ b/src/main/java/org/distorted/examples/meshfile/MeshFileRenderer.java @@ -328,7 +328,7 @@ class MeshFileRenderer implements GLSurfaceView.Renderer, DistortedLibrary.Excep private void createMesh() { FactoryCubit factory = FactoryCubit.getInstance(); - mMesh = factory.createMegaminxCornerMesh(); + mMesh = factory.createMegaminxEdgeMesh(0.2f,0.5f); //mMesh = createStaticMesh();