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jPCT - a 3d engine for Java => Support => Topic started by: luispablo on September 04, 2006, 04:39:30 am
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Hi,
I know this is a VERY newie question :oops:, but I can't draw a rectangle with, for example, one side with 10 and another one with 3. I'm only able to draw squares, with all side with the same length! :roll:
Thanks in advance
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Hi, jpct is not a 2d engine so you can draw only the 3d primitives pre defined, as I remember there is not a rectangular prism, only cubes, if you need it you bay think on drawing a cube and extruding it by some methid that I dont know or even draw many cubes until get thye desired rectangles and merge all of them into a higher whole shape.
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I know it's 3D, but I'm trying to build a corridor, and it must have its walls, floor and ceiling in the form of rectangles.
I'm using Primitives.getPlane(), but this method only creates squares. How can I transform them to set its mesures?
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If you want to build a 3d scence you better use a 3d modeling software like 3ds max and load it into jpct.
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Thanks a lot. I'll take your advice and try to use a modeling soft.
But, anyway, can I draw a rectangle somehow?
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Yes, but only by building it yourself. This can either be done by using Object3D.addTriangle() or by merging multiple planes as returned by getPlane() into a rectangle. But that one may not have the texture properties you want. I may add a method to create a rectangle. I can give you the code of Primitves.getPlane(). It should be easy for you to change it in a way that it creates rectangles instead:
public static Object3D getPlane(int quads, float scale) {
float startx=-scale*(float) quads/2f;
float starty=startx;
float tx=0f;
float ty=0f;
float dtex=(1f/(float) quads);
Object3D obj=new Object3D(quads*quads*2+8);
for (int i=0; i<quads; i++) {
for (int p=0; p<quads; p++) {
float dtx=tx+dtex;
float dty=ty+dtex;
if (dtx>1f) {
dtx=1f;
}
if (dty>1f) {
dty=1f;
}
obj.addTriangle(startx, starty, 0, tx, ty, startx, starty+scale, 0, tx, dty, startx+scale, starty, 0,
dtx, ty);
obj.addTriangle(startx, starty+scale, 0, tx, dty, startx+scale, starty+scale, 0, dtx, dty, startx+scale,
starty, 0, dtx, ty);
startx+=scale;
tx+=dtex;
}
starty+=scale;
startx=-scale*quads/2;
tx=0;
ty+=dtex;
}
return obj;
}
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BTW: Melssj5 is right when he suggests to use a modelling software instead because building a level out of primitives is very inefficient rendering wise.
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:wink: 8)
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mark~