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Software renderer&interpolation

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I have started to write a software renderes,but I have stumbled across a problem:interpolating texture coords.Let''s say we have a triangle.What I did until now is: 1)turn it into a 2D shape 2)interpolate the texcoords along the lines that constist the triangle. Then,of course,I use scan lines to fill the triangle and interpolate the coords in the x axis. I have a problem with (1).I interpolate the coords along a 2D line and this gives me wrong perspective results.But I don''t see how I can do interpolation along a 3D line.

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Nevermind,I found some excellent articles in http://www.d6.com/users/checker/misctech.htm that descive perspective texture mapping.They were mentioned in another thread about software rendering.

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