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POgluDisk rotation for mapping
 

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    <p>I'm trying to create sub-cursor for terrain mapping.</p> <p>Basic by code: (old image, but rotation is same)</p> <p><a href="http://www.sdilej.eu/pics/274a90360f9c46e2eaf94e095e0b6223.png" rel="nofollow noreferrer">image http://www.sdilej.eu/pics/274a90360f9c46e2eaf94e095e0b6223.png</a></p> <p>This is when i testing change glRotate ax to my numbers: </p> <p><a href="http://www.sdilej.eu/pics/146bda9dc51708da54b9249706f874fc.png" rel="nofollow noreferrer">image2 http://www.sdilej.eu/pics/146bda9dc51708da54b9249706f874fc.png</a></p> <p>What i want: </p> <p><a href="http://www.sdilej.eu/pics/69721aa237608b423b635945d430e561.png" rel="nofollow noreferrer">image3 http://www.sdilej.eu/pics/69721aa237608b423b635945d430e561.png</a></p> <p>My code:</p> <pre><code>void renderDisk(float x1, float y1, float z1, float x2, float y2, float z2, float radius, int subdivisions, GLUquadricObj* quadric) { float vx = x2 - x1; float vy = y2 - y1; float vz = z2 - z1; //handle the degenerate case of z1 == z2 with an approximation if( vz == 0.0f ) vz = .0001f; float v = sqrt( vx*vx + vy*vy + vz*vz ); float ax = 57.2957795f * acos( vz/v ); if(vz &lt; 0.0f) ax = -ax; float rx = -vy * vz; float ry = vx * vz; glPushMatrix(); glTranslatef(x1, y1, z1); glRotatef(ax, rx, ry, 0.0); gluQuadricOrientation(quadric, GLU_OUTSIDE); gluDisk(quadric, radius - 0.25, radius + 5.0, subdivisions, 5); glPopMatrix(); } void renderDisk_convenient(float x, float y, float z, float radius, int subdivisions) { // Mouse opacity glColor4f( 0.0f, 7.5f, 0.0f, 0.5f ); GLUquadricObj* quadric = gluNewQuadric(); gluQuadricDrawStyle(quadric, GLU_LINE); gluQuadricNormals(quadric, GLU_SMOOTH); gluQuadricTexture(quadric, GL_TRUE); renderDisk(x, y, z, x, y, z, radius, subdivisions, quadric); gluDeleteQuadric(quadric); } renderDisk_convenient(posX, posY, posZ, radius, 20); </code></pre>
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