Related to applying texture using opengl

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Hi all,

Thanks in advance. i need some help regarding below issue.

I am writting a C# code with opengl. i am not able to apply texture for selected entity from screen (3D Model). The entity may be a plane, polygon, surface or it may be any uneven surface. once i will select the entity from 3D model then i should able to apply texture for the whole surface/body. Here i can able to select the entity and can able to apply color or material. but texture could not able to apply.
i can able to apply textures only for selected plane through loading texture and applying it for 4 vertices of selected plane using glBegin(GL_QUARDS) and glEnd(). but i want to apply texture for selected face/surface id (or) generated openGL list (or) generated unique tag, without mapping texture using glBegin and glEnd(). Can anyone help me please.

thanking you.

Posted 9-Oct-12 18:32pm

BalsP

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enhzflep 10-Oct-12 1:13am

Sure thing mate - go and look at these tutorials: http://nehe.gamedev.net/tutorial/lessons_06__10/17010/

Santhosh G_ 10-Oct-12 1:46am

For mapping textures for an un-even structure or polygons, Split the shape into triangles. And provide texture coordinate for each vertex of the triangle.

BalsP 10-Oct-12 2:00am

thanks Santhosh. i wil try to split into triangles and Is it possible any other way to apply textures for hole, chamber, fillet, non-rectangular polygon or face id.

Santhosh G_ 10-Oct-12 2:55am

If the object is similar to quad, then you can map texture coordinates easily.
Please check these links,
http://www.nvidia.com/object/cube_map_ogl_tutorial.html
http://jerome.jouvie.free.fr/opengl-tutorials/Tutorial11.php

Member 9156454 15-Apr-13 7:59am

Hi Santhosh.i have tried to apply texture for tesselation of cad models.stil i am not getting ttexture mapping on all trianle faces. i am rendering all geometry faces and then i am trying apply. is it possible to render all faces and apply then texture. thanks in advance.

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