TEXTURE MAPPING (Walls only)<\/p>\n
I have been testing and trying to do
\ntexture mapping and I finaly found out
\nthe basics and got it to work. So I
\nhave first written down the matimatical
\nbasics and then a easy to understand
\nbasic code. Hope you find it useful
\nAnd if you do then please write me
\na note and dont forget to give me some
\ncredit in your production…
\nFirst you got your picture in memory,
\nwich I describe like this:
\n
\n[code lang=”delphi”]
\n Xm
\n +——–+
\n | |
\n | | Ym
\n | |
\n +——–+
\n[\/code]<\/p>\n
And this picture shall be putted out
\nin this polygone:
\n[code lang=”delphi”]
\n X1,Y1
\n +—___ x2,y2
\n | —+
\n | |
\n | |
\n | ___—+
\n +— X3,Y3
\n X4,Y4 <\/p>\n
[\/code]
\nNow you only got to do this procedure
\nevery pixel in the polygone:<\/p>\n
PLOT X, Y, POINT(Xp, Yp)<\/p>\n
Well what is Xp and Yp then?
\nWell you only got to use theese two
\nformulas:<\/p>\n
[code lang=”delphi”]
\n Xm*(X-X1)
\nXp = ————
\n X2 -x1<\/p>\n
(Y2-Y1)*(X-X1)
\n Ym*(y-\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4)
\n X2 -x1
\nYp = \u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4
\n X*(Y3-Y2-Y4+Y1)
\n Y4-Y2+\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4\u00c4
\n X2 -x1<\/p>\n
[\/code]
\nAs a little hint I could say that you
\nbetter do this in assembler and that
\nyoy draw the polygone in columns not
\nby lines. And make some kind of
\ndelta values and just add in the inner
\nloops.<\/p>\n
Well I maybe shall help you started
\nwith a little test in Basic. You maybe
\ndont recognise the formula but if you
\ndont then you better dont try to code
\nany Texture mapping at all!!!<\/p>\n
[code lang=”basic”]FOR X = x1 TO X2
\n Xp = (Xm * (X – x1)) \/ (X2 – x1)
\n Ys = Y1 + ((y2 – Y1) \/ (X2 – x1) * (X – x1))
\n Ye = Y4 + ((Y3 – Y4) \/ (X2 – x1) * (X – x1))
\n FOR Y = Ys TO Ye
\n Yp = (Ym * (Y – Y1)) \/ (Ye – Ys)
\n PLOT X, Y, POINT(Xp, Yp)
\n NEXT Y
\nNEXT X
\n[\/code]
\nSome more hints is to make the original
\npicture in a length and width of 32, 64
\n128 or something equaly easy to ROL
\ninstead of MULU.<\/p>\n
Then I in my own code (On ST) got one
\nseperate precalculated code for every
\ncolour to plot, and one extra for
\ntransparent picture. (Windows) And
\nthe transparent cod is one line long
\nand includes a RTS so guess what P-time
\nthat one takes!?!<\/p>\n
Well thats it, good luck from
\nPeyloW of T.O.Y.S.<\/p>\n
Greetz goes to:
\nTaM, Thanx for all but coding
\nMe, Say helo to Josefin.
\nAIO (Pseudo), Thanx for all muzix.
\nHydrogen, Hey there.
\nEagle, Havent seen you for a long…
\nOB, I look forward to SUB STAION.
\nMF, Min sladd tack !!!
\nAnd to all others…<\/p>\n
My address if you need it ?!?<\/p>\n
PeyloW of T.O.Y.S.
\nGreby
\n59042 Horn
\nSweden<\/p>\n
And phone #:
\n0494-30404
\n(I love a long chat but only 18-21)<\/p>\n
See ya…<\/p>\n
[tags]Delphi, Graphic[\/tags]<\/p>\n","protected":false},"excerpt":{"rendered":"
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