Rendering Lines

Hi Qulacomm community! I worked a little bit on my AR-App for my Bachelor Thesis. I tried several things, with mixed results. First I calculated a natural cubic spline for some nice looking movements. Theoretical a nice idea, practical a absolute distaster :). Then I wanted to improve my Tap-Event with a ray picking solution. I Managed to get a BoundingBox from an Object at runtime: [CODE]void calculateBoundingBox() { int i = 0; float MaxX = uSchiffOneTextureVerts[i] , MinX = uSchiffOneTextureVerts[i] , MaxY = uSchiffOneTextureVerts[i+1] , MinY = uSchiffOneTextureVerts[i+1] , MaxZ = uSchiffOneTextureVerts[i+2] , MinZ = uSchiffOneTextureVerts[i+2]; for (i = 0; i < (uSchiffOneTextureNumVerts); i+=3) { //Min/Max Berechnung für die X Werte innerhalb des Float Arrays if (uSchiffOneTextureVerts[i] <= MinX) { MinX = uSchiffOneTextureVerts[i]; } else if (uSchiffOneTextureVerts[i] > MaxX) { MaxX = uSchiffOneTextureVerts[i]; } //Min/Max Berechnung für die Y Werte innerhalb des Float Arrays if (uSchiffOneTextureVerts[i+1] <= MinY) { MinY = uSchiffOneTextureVerts[i+1]; } else if (uSchiffOneTextureVerts[i+1] > MaxY) { MaxY = uSchiffOneTextureVerts[i+1]; } //Min/Max Berechnung für die Z Werte innerhalb des Float Arrays if (uSchiffOneTextureVerts[i+2] <= MinZ) { MinZ = uSchiffOneTextureVerts[i+2]; } else if (uSchiffOneTextureVerts[i+2] > MaxZ) { MaxZ = uSchiffOneTextureVerts[i+2]; } } LOG("MinX: %f, MaxX: %f, MinY: %f, MaxY: %f, MinZ: %f, MaxZ: %f",MinX, MaxX, MinY, MaxY, MinZ, MaxZ); float BB[] = { //front MaxX, MaxY, MaxZ, //P7 MaxX, MinY, MaxZ, //P3 MinX, MaxY, MaxZ, //P1 MinX, MinY, MaxZ, //P5 MinX, MaxY, MaxZ, //P1 MaxX, MinY, MaxZ, //P3 //back MaxX, MaxY, MinZ, //P8 MaxX, MinY, MinZ, //P4 MinX, MaxY, MinZ, //P2 MinX, MinY, MinZ, //P6 MinX, MaxY, MinZ, //P2 MaxX, MinY, MinZ, //P4 //top MaxX, MaxY, MaxZ, //P7 MinX, MaxY, MaxZ, //P1 MinX, MaxY, MinZ, //P2 MaxX, MaxY, MinZ, //P8 MaxX, MaxY, MaxZ, //P7 MinX, MaxY, MinZ, //P2 //bottom MaxX, MinY, MaxZ, //P3 MinX, MinY, MaxZ, //P5 MinX, MinY, MinZ, //P6 MaxX, MinY, MinZ, //P4 MaxX, MinY, MaxZ, //P3 MinX, MinY, MinZ, //P6 //right MaxX, MaxY, MaxZ, //P7 MaxX, MinY, MaxZ, //P3 MaxX, MinY, MinZ, //P4 MaxX, MaxY, MinZ, //P8 MaxX, MinY, MinZ, //P4 MaxX, MaxY, MaxZ, //P7 //left MaxX, MaxY, MaxZ, //P1 MaxX, MinY, MaxZ, //P5 MaxX, MinY, MinZ, //P6 MaxX, MaxY, MinZ, //P2 MaxX, MinY, MinZ, //P6 MaxX, MaxY, MaxZ //P1 }; int size = sizeof(BB) / sizeof(float); LOG("Size: %i",size); for(int count=0; count < size ; count++) { LOG("Size: %i",count); BBUebergabe[count] = BB[count]; }; }[/CODE] Any Improvements are welcome! With the gathered vertices i tried to draw colored triangles: [IMG]http://sceada.bplaced.net/vuforia/ShipInABox.png[/IMG] My actual purpose is to implement a ray-box-intersection. In fact that the 2D solution makes a lot of problems, if the 3D-Object is watched from the side. I copied two methods from the domino example [LIST] [*]projectScreenPointToPlane [*]linePlaneIntersection [/LIST] I solved the actual Tap-Event a little bit different than in the domino example, anywhere. I implemented a lot of Log messages for some tests . [QUOTE]04-14 12:23:16.070: I/IMAGE_TARGETS(944): MinX: -0.072848, MaxX: 0.069527, MinY: -0.175295, MaxY: 0.082582, MinZ: -0.258850, MaxZ: 0.222944 04-14 12:23:16.070: I/IMAGE_TARGETS(944): Size: 108 04-14 12:23:17.200: I/IMAGE_TARGETS(944): Configure Video Background : Video (640,480), Screen (480,800), mSize (600,800) 04-14 12:23:17.430: I/IMAGE_TARGETS(944): getFocalLength(): 617.117981, 618.848022 04-14 12:23:17.430: I/IMAGE_TARGETS(944): getPrincipalPoint(): 320.000000, 240.000000 04-14 12:23:17.430: I/IMAGE_TARGETS(944): getDistortionParameters(): 0.154197, -0.377212, -0.001747, -0.000489 04-14 12:23:19.960: I/IMAGE_TARGETS(944): tapx: 169.857819, tapy: 366.257507 04-14 12:23:19.960: I/IMAGE_TARGETS(944): halfScreenWidth: 240.000000 04-14 12:23:19.960: I/IMAGE_TARGETS(944): halfScreenHeight: 400.000000 04-14 12:23:19.960: I/IMAGE_TARGETS(944): halfViewportWidth: 300.000000 04-14 12:23:19.960: I/IMAGE_TARGETS(944): halfViewportHeight: 400.000000 04-14 12:23:19.960: I/IMAGE_TARGETS(944): x: -0.233807 04-14 12:23:19.960: I/IMAGE_TARGETS(944): y: 0.084356 04-14 12:23:19.960: I/IMAGE_TARGETS(944): lineStart.data[0]: -0.361336, lineStart.data[1]: 0.717794, lineStart.data[2]: 0.337030 04-14 12:23:19.960: I/IMAGE_TARGETS(944): lineEnd.data[0]: 3.171073, lineEnd.data[1]: -7.679066, lineEnd.data[2]: -3.885688 04-14 12:23:19.960: I/IMAGE_TARGETS(944): intersection.data[0]: -0.079402, intersection.data[1]: 0.047611, intersection.data[2]: 0.000000 //2D Solution. 04-14 12:23:19.960: I/ImageTargets(944): ToucEvent X: 169.85782| Detect X: 229.65517 04-14 12:23:19.960: I/ImageTargets(944): ToucEvent Y: 366.2575| Detect Y: 450.0[/QUOTE] Looks something wrong for you guys? How can I imagine the lineEnd, lineSTart and intersection vector? Why is everything normalized to -1 and 1? How can i do a ray cast with these values, anyone an idea? To my actual thread title. I want to display my BoundingBox without any filling. I tried the following shading: [QUOTE]static const char* PointVertexShader = " \ \ attribute vec4 PointvertexPosition; \ uniform mat4 modelViewProjectionMatrix; \ \ void main() \ { \ gl_Position = modelViewProjectionMatrix * PointvertexPosition; \ } \ "; static const char* PointFragmentShader = " \ \ precision mediump float; \ void main() \ { \ gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0); \ } \ ";[/QUOTE] And [QUOTE]/*for(int i = 0; i < 12; i++) glDrawArrays(GL_TRIANGLE_STRIP, i*3, 4);*/[/QUOTE] But nothing is drawn at runtime. I Know it is saturday and I have a lot of questions, hopefully I get all of them answered :p. - Robert