The comments that Hannes says here are correct. Make certain that you do not confuse image texels and screen pixels or world coordinates. They do not have anything in common really.
The "best way", at least right now, is to use polygon with the pix_coordinate object. pix_coordinate lets you set the texture coordinates explicitly for each vertex. You will use (0,0), (1,0), (0,1), and (1,1) (not sure about the order, depends on how you set up polygon). There is a help file for pix_coordinate. The default texture behavior for polygon is a little strange. I had assumed that people would set their own texture coordinates.
Sounds like GEM needs a rectangle object...
For the "case" issues, try route.
Later, Mark
============================ = mdanks@stormfront.com = http://www.danks.org/mark ============================
-----Original Message----- From: umläute [mailto:zmoelnig@iem.mhsg.ac.at] Sent: Monday, February 21, 2000 2:36 AM To: pd-list Subject: Re: texturing video onto rectangular area
James Rojsirivat wrote:
hello,
i'm working on a project and need some advice. in the gem_movie.pd, the example has the movie file textured onto the <cube>
object...in a
version of the same project i'm working on, i used the
<square> object
onto which my file is textured. However, ideally, i'd like
the movie
to retain its shape. in the current version i'm working on, i have the <pix_movie> object connected to a <polygon> with an argument of <4>. the x y z coordinates are assigned so that z = 0. the problem is that when i render, i can't get anything to show
up on the
screen. what am i doing wrong? i'm including the video section of the program. any help is greatly appreciated.
i think the way you are treating coordinates is a little bit confused... in your demo you create a window that is sized 600*400 PIXELS. then you are using these numbers (600, 400) as arguments for your polygon, which will definitely produce something you don't want (ever tried tor create a square with a dimension of 600 ? - a little bit huge...i will mostly use sizes of 1 to 4) when you change the points of your polygon to range below 10 (scale it by 1/200 that's 3 for 600, 2 for 400) you will (hopefully, though i am not very sure) get what you want
also, is there a way to create a CASE like statement in pd?
i'm using
<moses> at the moment, and it seems awfully clunky.
james
that was bothering me too, but i do think there are elegant solutions using relational-operators (in the case of an exact "case" just use "==") and "select"
mfg.fd.ras hannes
-
Mark Danks