Esmeralda Osornio
3480 - Computer Graphics Project Idea 
Water Ripples



   Description:
 

    I will make water ripples that are caused be a droplet using the sin funiction and lab 8's ray tracer.



   My computer graphics elements:
 

    1. bump-mapped surface
    2. motion damping
    3. simulation of fluid motion



   To demonstrate my study and research:
 

    1. I will make a gif animation
    2. I will use lab 8 as my starting point.



Progress:
 

First Attempt:
Sine floor and sphere has transparency
Mathematical sine function will be used to move the ripples of the water

       
 gif goes here 




Second Attempt:
Floor has been modified based on lab 11
A water drop cause the ripples

       
 gif goes here 




Third & Fourth Attempt:
Left animation:
Fixed the amplitude by creating an offset that increase for each render
Added a refraction function for the sphere (doesn't seem to work)
Right animation:
Fixed the offset again, since the animation above seems abnormal towards the end


       
 gif goes here gif goes here 




Fifth & Sixth Attempt:
Fixed the offset, distance, & amplitude
Animation on the left has an amplitude of 32
Animation on the right has an amplitude of 16


       
 gif goes here gif goes here 







 
Lab-15 work done


       
 gif goes here gif goes here 


 
The left animation seems to recoil back into the center towards the end. 
In the right animation, it's fixed.


       
 gif goes here ray trace gif goes here 


 
Fixed camera position




 
Now that I have fixed when the ripples show appear, 
I will work on "flatting" the ripples after a certain 
point starting from the center. 
~check above for final attempt~












Final Attempt:
There are two important items that are needed for my amimation to look
the same as the animation on the right.

1. Multiple waves from the center
I thought of one way to make this. I thought that maybe if I save the 
previous vector, calculate the current vector, and then trace both vectors
that it might show the waves from the first droplet and the second 
droplet as the same time. However, I can only have one vector
equal to the closehit.norm. Meaning that I can only have one vector drawn.
What I did instead is have the amplitude greater when the second
droplet hits the surface. 
First droplet's amplitude = 8.0
Second droplet's amplitude = 32.0
However, this did not really help accomplish anything regarding 
the multiple waves, since it just overrides the previous waves.

2. "Flatting" the ripples from the center after the last droplet
One way that I thought that I can do this is by using the rules
for stretch and compression for transformation in equations. 
For example, the image of graphs below illustrate stretch and compression 
for the sine function.



       
 gif goes here gif goes here 



       
 picture goes here 



sin(x) = normal sine wave
sin(1/2 * x) = stretch horizontally
1/2 * sin(x) = compressed vertically





Final Attemp 2:


       
 gif goes here 










 
Failed Attempts:


    
 gif goes here picture goes here 



 
The animation on the left is a failed attempt of trying to get the sin waves to move. (refraction function not present)
I tried changing the amplitude, since the vectors depend on amplitude as well as other values. 
I also tried putting the entire process in the if statement of the SURF_WATER in a for loop. 
However, when the animation started, the surface was not doing anything. 
The image of the right is a failed attempt of the refraction function. 
I used the scratchapixel function; however, it still didn't seems to work. 


Link to Scratchapixel




An example:

       
 ray trace gif goes here 


        




     The screenshot & animations from my lab-8 is below:

      
 ray trace image goes here 


      
 ray trace image goes here 


      
 ray trace image goes here 



     The animation from my lab-6 is below:

       
 rocket goes here