 # Hojun Yoon

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Peon

## Personal Information

• Name
Hojun Yoon
1. ## Visualizing mathematical things using Houdini

@Librarian Thank you for sharing! The resources you shared are really helpful to me!
2. ## Visualizing mathematical things using Houdini

Hello, I recently started Houdini and I realized it can be used as a powerful visualization tool for learning mathematics. I visualized the slope field of Lotka-Volterra equations, which are commonly known as predator-prey model. Also, I posted a more detailed explanation of my work on my website. Now, I'm very interested in learning lighting/post-processing skills. So I'd like to know if there are great tutorials on it. Thank you!
3. ## Accessing the nearest voxel from a point in OpenCL node

Hello, I'm trying to implement an OpenCL node that loops over "scatter1" node's points and changes density at the volume A's nearest voxel of every point. However, I can't figure out how to calculate the nearest voxel's index value. So I'd like to know how to calculate the voxel's index value. Also, in the "merge1" node, there is one point added by the volume A(Points count is increased by one after merging). Is there a way to exclude that point when looping over points? I attached my node setup and "opencl1" node's bindings setup below. Thank you.
4. ## Matrix multiplication and outer product using HDK

Hello, I'd like to perform matrix multiplication between 2 of 3x3 matrices(not coefficient-wise) and outer product between 2 vectors using HDK. So I'd like to know if the * operator supports matrix multiplication and outer product of vectors as in the example code below. UT_Matrix3 A = ... UT_Matrix3 B = ... UT_Matrix3 C = A * B // matrix multiplication UT_Vector3 u = ... UT_Vector3 v = ... UT_Matrix3 X = u * v // outer product If not, is there a function/operator to do matrix multiplication and outer product? Thank you.
5. ## Accessing a voxel of SIM_ScalarField by index

Hello, I'm trying to write a microsolver that changes the scalarfield's voxel value according to the points position of the given geometry. So, I'd like to know how to access the voxel data of SIM_ScalarField by index vector without iterating entire field. For example, changing the voxel value in [2, 10, 6] to 1. Thank you.
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