good morning, I have a problem with a project I'm doing in OpenGL,
but a problem I do not know how to begin to do this,
what I want is a sphere of OpenGL (glutsolidsphere) might
insert a letter (just like a billiard ball) but that this
in the contours of the sphere (3D) that is not flat but have
curves is the area, and try to download the FreeType but
achievement to make it work (using the visual c 2008), I hope I can get a
idea of how to do it. thanks.
Render the text to a 2D texture.
Apply the 2D to the sphere.
Read about FBO (GL_EXT_framebuffer_object) if you don't know how to render to a texture.
Code examples are here
http://www.opengl.org/wiki/GL_EXT_framebuffer_object
and there are various articles on the net.
------------------------------
Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);
V-man do you have projective texturing in mind or something else?
john you can also create a texture atlas with glyphs and apply those, not absolutely necessary to render to texture. There are utilities that can help you with that. The big question for you is probably how to generate those texture coordinates.
sorry for the question, but as rendering the letters, I am beginning to
OpenGL, the examples I found are not very clear on the copy and fbo
Paste the examples I found and I get errors, any help please c.
thanks!
No, he should just apply it to the sphere. Of course, your text needs to be small. It should not cover the entire texture. You could make a "8" ball or any other pool ball this way.Originally Posted by ugluk
------------------------------
Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);
forgiveness that is so slow, but the truth is that I have no idea how
First, what libraries need?, any instance in which I can base,
thanks.
Probably the simplest thing would be to model your sphere in a modeling program, apply the texture in using whatever mapping method you want, then importing this model into you app.
Thanks for responding,
But I'm from 0.
Firstly as I can model ... what program do I need?, as I can make
export? some algorithm?
use visual c 2008.
thanks for answering
Forget the modeling program.
If you want to learn GL, get the Red Book and learn the basics. The Red Book is online. It covers GL 1.1. It shows how to use GLUT, GLU and GL. I think they use AUX for loading BMP files which is dead and gone now. Use DevIL to load image files, which is here
http://openil.sourceforge.net
------------------------------
Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);
Oh no, not devil. It's a bad program for beginners, since you need a lot of libraries and it's just a wrapper over different libraries anyways. Instead check this out:
http://nothings.org/stb_image.c
This is the best.
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