I’ve been distracted from Cog production recently because of paid work. That doesn’t mean I have been idle with concept work. I have been mulling over how to set large objects in water such as ocean liners or islands.
My ocean concepts work OK but as soon as an object is placed in the water an unrealistic sharp edge breaks the illusion.
After re-watching ‘Son of Kong’, (yes only just released on DVD along with King Kong 1933 and Mighty Jo Young) I noticed that Willis O’Brien used a simple blurred matt to create the island sinking beneath the waves. I thought a similar technique could be utilized in Blender.
It was quite simple. Create a Black & White pass of the island (white) against the waves (black). Blur this in a photo program. Then map it back onto the island from the object ‘Camera’. Use this as an Alpha and low and behold you have a travelling matte that smoothly mixes the island into the ocean.
You will have to adjust the size and orientation of the mask to correctly size and position the mask to work.
You can even take it one stage further and offset the mask in time to give reasonable wave spray for an island at long to medium distance from the camera.
Here’s a short concept animation:-