Billboard text is upside down

Question

First thing, I am not a seasoned game developer. I am using game development as a conduit to learn programming.

I am attempting to put the player names above the player's head's. I am using a variation of Shawn Hargreaves solution;

            basicEffect.World = Matrix.CreateConstrainedBillboard(textPosition, textPosition - cameraFront, Vector3.Down, null, null);
            basicEffect.View = view;
            basicEffect.Projection = projection;

            const string message = "hello, world!";
            Vector2 textOrigin = spriteFont.MeasureString(message) / 2;
            const float textSize = 0.25f;
            spriteBatch.Begin(0, null, null, DepthStencilState.DepthRead, RasterizerState.CullNone, basicEffect);
            spriteBatch.DrawString(spriteFont, message, Vector2.Zero, Color.White, 0, textOrigin, textSize, 0, 0);
            spriteBatch.End();

My game is space based, so I needed the text to rotate on all 3 axes, so I implemented the following;

        foreach (PlayerShip objPlayerShip in objPlayers)
        {
            Vector3 objTextPosition = objPlayerShip.objShipVector + new Vector3(0, 3, 0);
            Vector3 objCameraFront = objManager.objCamera.objCameraPostion;

            objBasicEffect.World = Matrix.CreateBillboard(objTextPosition, objCameraFront, objManager.objCamera.objCameraUp, null);
            objBasicEffect.View = objManager.objCamera.objViewMatrix;
            objBasicEffect.Projection = objManager.objCamera.objProjectionMatrix;

            string strText = objPlayerShip.strGUID.ToString();
            Vector2 objTextOrgin = objCourierNew.MeasureString(strText) / 2;

            spriteBatch.Begin(0, null, null, DepthStencilState.Default, RasterizerState.CullNone, objBasicEffect);
            spriteBatch.DrawString(objCourierNew, strText, Vector2.Zero, Color.Green, 0, objTextOrgin, 0.09f, SpriteEffects.None, 0.0f);
            spriteBatch.End();

        }

It seems to be working, but the text is upside down. How would I flip the text right side up? I know I have to change something in objBasicEffect.World. I try to tweak it, but I just make things worse...

Any help would be appreciated. Linuxx

Answer 1

As it appears my text was both upside down, and backwards. I solved this with;

spriteBatch.DrawString(objCourierNew, strText, Vector2.Zero, Color.Green, 0, objTextOrgin, 0.09f, SpriteEffects.FlipHorizontally | SpriteEffects.FlipVertically, 0.0f);

I feel really stupid it was so basic... :-/

Then again, I did learn how to combine enum's!

Thanks for your help Adam.

p.s. I couldn't answer my own question until 8 hours had passed. I'm a new user...

Linuxx