With the more latter versions of blender, toon - rendering is as simple as clicking a button but this tutorial is going to cover Lighting , Texturing and The final render
1. Keep the default cube
2. go into shaded mode and then into camera view and u will notice that 1 of the sides of our cube is black this is because of absence of any light on this side of the cube
3. To light up this side stay in camera view and select the lamp then press the G(grab),Y(Y-axis) keys to move the lamp and drag to a suitable position so that the side will be lit up (as shown in the image below)
4. Now lets get to the texturing , i added a nice blue shade to my cube u can also do the same by looking at the image below
5. Once the texturing is done click the Scene Tab (F10) and then activate 'edge' , click on edge settings and then change the 'Eint' value to about 225 ('Eint' value helps to define your 2D outlines so it's not too bad to set it to a high level) and also we want the border lines to remain black so keep it at it's default .
6. Render your image ! and as u can see u have a nice solid outline on your cube
7. Another example -
[attachment=0]Flower and vase .jpg
I hope u liked the tutorial please post your feedback and your awesome looking toon renders




