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    <p>Ok, You have your ortho matrix and quad, so whats the problem, translate modelview matrix of your quad to desired position (x,y,z=0), multiply it by ortho matrix , pass multiplied matrix to vertex shader, multiply vert position by your matrix and done :), i am not using any lookat function in my code to do this, but i have own code for matrices computation its partially code from some bada tutorial, for projection matrix i have other function.</p> <pre><code> void Letter::Ortho(Matrix* result, float fovy, float aspect, float nearZ, float farZ) { GLfloat frustumW, frustumH; frustumH = tanf(fovy / 360.0f * PI) * nearZ; frustumW = frustumH * aspect; Frustum(result, -frustumW, frustumW, -frustumH, frustumH, nearZ, farZ); } void Letter::LoadIdentity(Matrix* result) { memset(result, 0x0, sizeof(Matrix)); result-&gt;m[0][0] = 1.0f; result-&gt;m[1][1] = 1.0f; result-&gt;m[2][2] = 1.0f; result-&gt;m[3][3] = 1.0f; } void Letter::Frustum(Matrix *result, float left, float right, float bottom, float top, float nearZ, float farZ) { float deltaX = right - left; float deltaY = top - bottom; float deltaZ = farZ - nearZ; Matrix frustum; if ((nearZ &lt;= 0.0f) || (farZ &lt;= 0.0f) || (deltaX &lt;= 0.0f) || (deltaY &lt;= 0.0f) || (deltaZ &lt;= 0.0f)) { return; } frustum.m[0][0] = 2.0f * nearZ / deltaX; frustum.m[0][1] = frustum.m[0][2] = frustum.m[0][3] = 0.0f; frustum.m[1][1] = 2.0f * nearZ / deltaY; frustum.m[1][0] = frustum.m[1][2] = frustum.m[1][3] = 0.0f; frustum.m[2][0] = (right + left) / deltaX; frustum.m[2][1] = (top + bottom) / deltaY; frustum.m[2][2] = -(nearZ + farZ) / deltaZ; frustum.m[2][3] = -1.0f; frustum.m[3][2] = -2.0f * nearZ * farZ / deltaZ; frustum.m[3][0] = frustum.m[3][1] = frustum.m[3][3] = 0.0f; Multiply(result, &amp;frustum, result); } </code></pre> <p>So, with this code : </p> <pre><code>LoadIdentity(&amp;matPerspective); Ortho(&amp;matPerspective, 60.0f, TEXMANAGER.aspect, -1.0f, 20.0f); LoadIdentity(&amp;matModelview); Translate(&amp;matModelview, x ,y ,z); Scale(&amp;matModelview,size); //Rotate(&amp;matModelview, 0.0f, 1.0f, 0.0f, 1.0f); Multiply(&amp;posMatrix, &amp;matModelview, &amp;matPerspective); </code></pre> <p>And pass posMatrix to shader :)</p>
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    1. COhow to compute the intervals of screen (0,0,maxXcoord,maxYcoord)? lets say i want to place at the right corner, how do i know that x,y is in the translated screen position?
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    2. COHow do I know where is a corner using ortho projection?
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    3. COWell, using my code, Center of screen is 0.0 x 0.0, right bottom corner is -1.0 -1.0
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