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Using Bump Maps to Make Realistic Water Effects

Reference Number: KB-01807 Last Updated: 11-10-2014 03:50 PM

The information in this article applies to:

Chief Architect Premier or Chief Architect Interiors


QUESTION

When I ray trace my image the water in my plan looks like glass. How can I make it look like water with different ripple effects?

 


ANSWER

The traditional way of creating water using a texture image can create some great looking images, however, in Chief Architect Premier and Interiors there is an even more power available in using bump maps.

In the image below we have created our pool and applied a generic water material from our Core Catalog. The resulting ray trace reveals a glass-like surface on the water so the stairs and tiles beneath the surface are unchanged. 



In the image above, our water material does not have a texture image associated with it, and we will have better control if we use the settings for our bump map.


Bump maps are simply images that are layered under the face created by the original material and the program uses the dark and light areas in the bump map to simulate changes in the surface of our model.

 

In this example, we will illustrate how applying a bump map can greatly increase the quality and realism of our swimming pool.

 


To set up the scene

  1. From a standard Full Camera ,  select the Adjust Material Definition  tool and click on the surface of the water.


  2. In the Define Material dialog's General panel select the color for the material, in this case a light blue.




  3. On the Texture tab make sure to clear any reference to a texture file.




  4. On the Properties panel the Material Class is Transparent is set to Water(1.33).


  5. Check Use Bump Map in Ray Trace Views and then click Browse to find our bump map.



    >> Click HERE if you would like to download the bump map used in this article.


  6. As this is a pool, and the water feature is large, we will set our Ratio to 100" by 100" with a Height Multiplier of 0.01.

    Note that as the bump map is increased in size the height multiplier is reduced to keep the waves from being too tall.

    If you want a more agitated looking pool then simply increase the height multiplier or decrease the Ratio. Trying different combinations will give you a feel for how the material of your choice interacts with the bump map.

  7. Click OK to accept the changes to the material and you are ready to begin your Ray Trace .


The result should apply a wavy pattern to the surface of the water distorting the objects beneath the surface of the water similar to the example below.




Helpful Tips: 

  • Since a bump map is just an image, you can use any image you have, or can find, to simulate a pattern.

    Keep in mind that the ratio and height multiplier can be changed accordingly if you don't have a texture.

    If you are using a texture, then the ratio of the bump map will match that of the texture.


  • For many materials, it is important to match the size of the bump map with the size of the texture being used on the material.

    In this situation, you may want to use the texture image as the bump map as well, which you can do in the "Define Material" dialog by copying contents of the Texture File field on the Texture tab, and pasting it into the Use Bump Map in Ray Trace Views field of the Properties tab.
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