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Making Of 'Rusty'

By Cesar Alejandro Montero Orozco
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Date Added: 9th December 2009
Software used:
Photoshop, LightWave

Lighting

I used FPrime 2.1 to render it. It is very easy and fast to use radiosity and Global Illumination with FPrime 2.1. I used 3 bounces for the 3 lights in this setup. The GI (Global Illumination) is a combination of blue and pink. The light on top gave me some good contrast and ambient shadows. While the lights on the right where used to create a Sun. The little one projected the strong shadow. The yellow big light on the right was used to create a sunset feeling.

418_tid_image_08.jpg
To tweak the intensities of the lights I use a process similar to one applied in real life. With a real camera, we can tweak its settings in order to get what is called "White Balance". In real life we use a neutral gray card (128,128,128 in RGB), and position it in front of our camera. We then zoom in, and balance the camera settings in order to make that card appear almost white in our viewer. It mostly involves tweaking the aperture, exposure and color balance.

This process can be imitated in Lightwave and other 3D applications. I first textured the entire scene with a neutral gray (128, 128, 128 in its RGB channels). Instead of tweaking the camera in Lightwave, I tweaked the lights. I tried to make that gray texture look almost white through my virtual camera. In this case, the wood planks where almost going white since the angle of the wood planks is the same of the area light that is projecting the sun. The trick relies in finding a balance in the "exposure" of all subjects portrayed.

On the left image we can see the scene textured with a neutral gray (128,128,128 in RGB channels). The image on the right shows only Rusty textured in neutral gray. It shows how radiosity is working over the gray texture.

418_tid_image_09.jpg
Once the lighting was done, I added some DOF (Depth of Field) to the camera. It is fairly easy to setup DOF in Lightwave. Once activated under the Camera Properties, a dotted circle appears. This tells us where the image will be sharp and focused. So I made this line "touch" Rusty. I then setup a Lens F-Stop of 8.0.

418_tid_image_10.jpg
FPrime speeds up the process of tweaking and refining textures and lights. With FPrime we can see changes in real time. We can zoom in and out using FPrime preview window. This allows me to tweak surfaces in detail. We can have at the same time more than 1 rendering window opened. FPrime starts with a grainy render, and as seconds pass by, grain goes away. This image shows Fprime results after less than 1 minute.

418_tid_image_11.jpg

Texturing

I used only procedural texturing for this image. For the grass, I applied several layers of procedural textures based on incidence angle, slope, light incidence and color to produce the grass. This gave the surface a softer look, and richer bounced colors.

I also made a procedural wood. It would have been easier to make an UV mapped wood for each plank. I however wanted to practice some procedural texturing. I kept a base of the resulting procedural wood texture. Then I made variances to the texture, and applied a different version to each wood plank. This gave the wood a subtle variety, making things less uniform but keeping the attention focused on Rusty.

418_tid_image_12.jpg
Rusty texture was a bit tricky. There was no SSS applied to rusty. It was all done using color, diffuse and luminosity changes based on incidence angle to camera and lights. This made the white texture look more interesting to the eye, and gave more volume to Rusty.

418_tid_image_13.jpg

Post - Processing

I always try to keep post-processing to the minimum. If the post-processing can be done for animation, I then do it. This is a healthy habit. When dealing with animation, it is not possible (or time consuming) to correct frame by frame. Learning post-processing that can not be applied to a sequence of images is not healthy. You can however alter things as brightness, contrast, saturation and levels to a whole sequence in programs as After Effects. That is the type of post process I allow myself in programs as Photoshop, since I know it can be migrated easily for animation in programs as After Effects.

Good post processing starts with good ordering. It is always a good habit to keep all layers ordered in categories. Here is an image showing different folders that contain the different layers of post-processing.

418_tid_image_14.jpg
Furthermore, it is important to apply pos- processing with "non-destructive" techniques. Generally filters in Photoshop are applied directly to an image. If you decide to go back and correct or tweak a filter, you can't once you save the file. A non- destructive change is the one that is applied to a layer other than the original image. It keeps the original image intact. By doing changes this way, you can go back and change any post-processing done in a more focused way. It also gives you the ability to change a low-res image with a final high res image on the fly. This allows you to do post-processing using a low res file, while you are still rendering the final high-res image.

In the following image we can see that there is a layer of "Color Balance". This layer can be tweaked by double clicking it. With this, we can return and change values as we please. Take also note that the original image is kept intact at the bottom of the layers.

418_tid_image_15.jpg
Post processing should save time. In this case, I decided to use it to alter values in brightness and contrast, as well as some variation in saturation. Doing it directly in Lightwave would be time consuming. I also used the alpha channel of the image to position some clouds on the backdrop. as a final touch, I added a signature reading "Rusty". In the following image you can see the difference of the original and post processed image.

418_tid_image_16.jpg
Original render                                                 With Photoshop filters

Final Image


This is the final image! I hope you liked the explanation of how I made it, as well as the final result!

418_tid_image_17.jpg  



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