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07312011, 08:35 PM #1
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 May 2011
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Parsing text not working in 3D projection script.
Well hello everyone, I have a small problem here. The problem is I have a script that draws 3d models that are in the OBJ Wavefront format onto the canvas. I have narrowed the problem I have down to a small section of the code, the code creates an array within an array to store the X,Y and Z coordinates, there is also some code that stores the linking of the vertices.
The arrays are as arranged as follows:
coordinate
0XYZ123 etc.
the vertices linking array is as above but with point 1 and point 2 as opposed to X,Y and Z. Within the array X,Y and Z (and also points 1 and 2 in their array) are numbered 0,1 and 2.
the code is this (I'll show it in context):
Code:function drawmodel() { var coordinate = new Array(); var edges = new Array(); textbox = document.getElementById('textbox'); fpos = textbox.value.search('f ')  1; coor = textbox.value.substr(0, fpos); link = textbox.value.substr(fpos, textbox.value.length); canvasthing = document.getElementById('main'); halfCW = canvasthing.width / 2; halfCH = canvasthing.height / 2; camZ = 0; camX = halfCW; camY = halfCH; Xrot = 0; Yrot = 0; Zrot = 0; FL = 10; ctx = canvasthing.getContext('2d'); //Below (the two for loops) is where it's going wrong (well, one of the places anyway :) for (i=0;i<coor.split('\n').length;i++) { var coordinate [i] = new Array(3); coordinate[i] = coor.split('\n')[i].substr(2).split(' '); } for (i=0;i<link.split('\n').length;i++) { var edges [i] = new Array(2); edges[i] = link.split('\n')[i].substr(2).split(' '); } j = 0; ctx.beginPath(); while (j<edges.length) { XYprem = Math.sin(Yrot) * edges[j] [2]; XY = Math.cos(Yrot) * edges[j] [1]  XYprem; XZprem = Math.cos(Yrot) * edges[j] [2]; XZ = Math.sin(Yrot) * edges[j] [1]  XZprem; YXprem = Math.sin(Xrot) * edges[j] [0]; YX = Math.cos(Xrot) * XZ  YXprem; YZprem = Math.cos(Xrot) * edges[j] [0]; YZ = Math.sin(Xrot) * XZ  YZprem; ZXprem = Math.sin(Zrot) * XY; ZX = Math.cos(Zrot) * YX  ZXprem; ZYprem = Math.cos(Zrot) * XY; ZY = Math.sin(Zrot) * YX  ZYprem; FLZ = FL + YZ + edges[j] [2]  camZ; SF = FL / FLZ; XcX = ZX + edges[j] [0]  camX; YcY = ZY + edges[j] [1]  camY; X = XcX * SF + halfCW; Y = YcY * SF + halfCH; ctx.moveTo(X, Y); j++; XYprem = Math.sin(Yrot) * edges[j] [2]; XY = Math.cos(Yrot) * edges[j] [1]  XYprem; XZprem = Math.cos(Yrot) * edges[j] [2]; XZ = Math.sin(Yrot) * edges[j] [1]  XZprem; YXprem = Math.sin(Xrot) * edges[j] [0]; YX = Math.cos(Xrot) * XZ  YXprem; YZprem = Math.cos(Xrot) * edges[j] [0]; YZ = Math.sin(Xrot) * XZ  YZprem; ZXprem = Math.sin(Zrot) * XY; ZX = Math.cos(Zrot) * YX  ZXprem; ZYprem = Math.cos(Zrot) * XY; ZY = Math.sin(Zrot) * YX  ZYprem; FLZ = FL + YZ + edges[j] [2]  camZ; SF = FL / FLZ; XcX = ZX + edges[j] [0]  camX; YcY = ZY + edges[j] [1]  camY; X = XcX * SF + halfCW; Y = YcY * SF + halfCH; ctx.lineTo(X, Y); j++; } ctx.stroke(); }
Thanks in advanced,
Alex.
08012011, 05:22 PM
#2
 Join Date
 May 2011
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*Bump*