giuseppe500

05-22-2012, 05:01 AM

hello.

I'm trying to create an ifc importer(an architectural format).

My problems are at the start:

1)i must use matrixes and vectors , how is knows :

1a)the order of multiplication of the matrix for vector?

1b)the coordinate system (left handed or right handed)?

1c)the matrixes are row major or column major?

after ,

if i have a different axis system , for example in my program i have y on top ,x on left and z inside and in the ifc i have z on top y on left and x inside , how i can import the geometrics items for have the same orientation and correct placing?

ps. the used api is opengl

thanks.

I'm trying to create an ifc importer(an architectural format).

My problems are at the start:

1)i must use matrixes and vectors , how is knows :

1a)the order of multiplication of the matrix for vector?

1b)the coordinate system (left handed or right handed)?

1c)the matrixes are row major or column major?

after ,

if i have a different axis system , for example in my program i have y on top ,x on left and z inside and in the ifc i have z on top y on left and x inside , how i can import the geometrics items for have the same orientation and correct placing?

ps. the used api is opengl

thanks.