Part1 Part2

Save your image as a PSD or bitmap to maintain maximum quality.

With the spacecraft selected (make sure you don't accidentally move it), select "object mask" from the render options at point "A".

Now render the image again. This provides us with a nice antialiased silloutte.

Save this image. That's it for bryce. You can close it now.

Take the mask render first. Select the whole image (Ctrl + A), copy it (Ctrl + C), and close it.

Paste the copied image into your first render. Because it is exactly the same size, the mask will line up perfectly on top of the render.

Now use the mask to make a selection. Go to Select > Colour range. Use the dropper to select the white. Fuzziness can be very high. Click OK to make the selection.

Now we have all the white in the mask selected, which corresponds to the space craft underneath.

You can hide the mask layer now.

You now have a layer containing just the spacecraft.

First we'll simulate a stationary camera. This will mean blurring the craft, and leaving the backround static.

With the isolated craft layer selected, go to Filter > Blur > Radial blur.

Many people make the mistake of using motion blur because it sounds like the right one. However, motion blur creates blur in both directions with no perspective. Radial Zoom blur creates the illusion that objects nearest to the camera are blurred more than objects further away.

The technique is to place the centre of the blur at the vanishing point of the perspective - or in other words, where the moving object is coming from. Since you don't get a preview for this filter, you will have to guess where it is. This can take a few goes!

The blur amount depends on the resolution of your image and how much blur you want. There's only one way to find out - experiment.

Simply repeat the above steps for blurring, but apply to the background layer instead. You may notice that doing it this way results in slight "ghosting" around the craft. This is because the craft in the background layer is blurring out from underneath the isolated one. To avoid this, you can re-render the scene without the craft, and use that for your background.

I hope you have enjoyed this tutorial. Please do email me to tell me what you think of this tutorial or if you would like to see more.

Don't forget, if you need more textures, check out my online store at renderosity.

Pete