Bottled Fluid simulation Bug - Solved!

-
After extensive testing and various debugging methods, I finally figured out where the problem is.  The clamp node I had didn’t allow negative values. However, whenever I enabled negative values and tested the bottle, the sine movement wasn’t working. It turns out  that I was moving the bottle through a small distance which meant the negative values were cancelling each other out thus making the sine very subtle. I didn’t see this until I finally moved the bottle at a larger distance. The Finterp Node was also the main culprit as it really hard to notice the problem and the interpolation speed was slow. Now, I need some sort of multiplier that would make the interpolation speed faster for shorter distances and slower for longer distances. Here is the screenshot with new changes:

This creates another problem- the sine motion goes crazy for physics based bottles with the newly implemented interpolation speeds for the Finterp Node. Physics based bottles worked fine with  the interpolation speed at default 1 for the Finterp Node.  Therefore, I added a Select float node to decide which interpolation method to use based on the physics boolean.

Comments

Post a Comment

Popular posts from this blog

Environment Showcase Concepts

-
Image
I thought it's about time to start working on creating the environment to showcase the water in the best way possible. It was suggested that I create this really cool Skull Waterfall environment concept art by Andrey Egorov: However, I will be using this concept as my initial inspiration and will be making my own iteration to the environment so it will not look exactly the same as the concept. It takes a bit of time figuring out and creating some of the features for the water shader. While I do this, I can work on creating the environment so I will be working on the water shader in small increments.
Read more

Distance Field water foam

-
Image
Distance Field Foam Vectortoradialvalue, DistanceFieldGradient used for U channel and DistanceToNearestSurface used for V. I thought about how texture coordinates worked and how VectorToRadialValue worked. Both being gradients in R(U) and G(V), I had a theory about creating coordinates based on using Distancetonearestsurface node as G(V) channel and have VectorToRadialValue or Distancefieldgradient node as the R(U) channel. I was initially going to use the DistanceFieldGradient node that I learned about when making the distance field flow map. This is because the node had that Texture coordinate look to it but it adds a lot to the shader instructions so I went with VectorToRadialValue node. I extracted and used maths for the R channel from VectorToRadialValue and it produced the coordinates I wanted. I then added this coordinate to the noise based foam I made earlier using Alex Vinogradov's approach. I later decided to add Distancefieldgradient node just to see if it pro...
Read more

World alignment (Tri-planar mapping)

-
Image
From reading the UE4 documentation, I found out that material functions are a bunch of nodes packed into one node. I figured out the Math behind how world alignment works by deconstructing and experimenting with the World Aligned Texture node. This node is one example of a material function. It is also widely known as Tri-planar mapping in substance painter. Material Function for Tri-planar mapping  This gave me the idea to make a block out material which can have grids, scale without texture stretching and change colours the way I want it to. I also wanted to add the functionality of animating the material. I did this by making some modifications to the World Aligned Texture material function. Modified Material function with comments to help understand which part is doing what. I found that substracting the WorldPosition from the Object Position will force the material to move along with the object and not have a weird scrolling effect whenever you move the obje...
Read more