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# flux101

Member Since 30 Aug 2012
Offline Last Active Jan 15 2013 05:06 AM

### Going crazy - 3D at GL 3.2 doesnt work

11 December 2012 - 05:45 PM

Hello everybody,
there is a situation that making me going crazy for at least a week. Im converting my engine to opengl 3.2. Works fine,as long as i only draw a colored fullscreen quad. I tried to display a cube, so ive created a perspective matrix, view matrix and model matrix, apply them to a shader and multiply them with the position of the vector. Nothing... (Black screen)

I had thought there must be a problem in my 3D math library (im not really a math whiz...), so i had looked for errors, other implementations and the problem didnt get solved. Maybe there is something little, something ive failed to notice... Now im asking you guys, perhaps you find my mistake.

[source lang="cpp"]inline Mat4 Mat4::Perspective(float fov, float aspect, float zNear, float zFar) { float h = tanf(fov * M_PIOVER360); float w = h * aspect; return Mat4(2.0f * zNear / w, 0.0f, 0.0f, 0.0f, 0.0f, 2.0f * zNear / h, 0.0f, 0.0f, 0.0f, 0.0f, -(zFar + zNear) / (zFar - zNear), -2.0f * zNear * zFar / (zFar - zNear), 0.0f, 0.0f, -1.0f, 0.0f); }[/source]
In camera class: mmProj = Mat4::Perspective(75.0f, 800.0f / 600.0f, 1.0f, 512.0f);

[source lang="cpp"]inline Mat4 Mat4::LookAt(const Vec3& eye, const Vec3& center, const Vec3& up){ Vec3 vZAx = Vec3(eye - center); vZAx.Normalize(); Vec3 vXAx = Vec3::Cross(up, vZAx); vXAx.Normalize(); Vec3 vYAx(Vec3::Cross(vZAx, vXAx)); return Mat4(vXAx.x, vYAx.x, vZAx.x, 0, vXAx.y, vYAx.y, vZAx.y, 0, vXAx.z, vYAx.z, vZAx.z, 0, -Vec3::Dot(vXAx, eye), -Vec3::Dot(vYAx, eye), -Vec3::Dot(vZAx, eye), 1);}[/source]
in camera class: mmProj = Mat4::LookAt(mvPos, Vec3(0, 0, 0), Vec3(0,1,0));

Model matrix is set to identity.

[source lang="cpp"]#version 150 layout(location = 0) in vec3 v3Pos; in mat4 m4Proj; in mat4 m4View; in mat4 m4Model; void main() { mat4 mvp = m4Model*m4View; mvp = m4Proj * mvp; gl_Position = mvp*vec4(v3Pos, 1.0); }[/source]