How to draw 3d billboard fixed independent distance size?
I'm using this:
float viewAngle = 35.0 * 3.14/180.0 * 0.5;
float dist = length(billboardPosition - cameraPosition);
float ratio = screenWidth/screenHeight;
float size = dist * 2.0 * tan(viewAngle)/(screenWidth/ratio);
float scaleX = billboardWidth * size;
float scaleY = billboardHeight * size;
float dist = length(billboardPosition - cameraPosition);
float ratio = screenWidth/screenHeight;
float size = dist * 2.0 * tan(viewAngle)/(screenWidth/ratio);
float scaleX = billboardWidth * size;
float scaleY = billboardHeight * size;
This works, but fixed billboard size little enlarges near the horizontal screen edges.
How to make it real constant size?
Could you plese describe it more clear, thanks))
AliasBinman 
