How to identify empty voxel?-CodePudding

I have to identify which voxels are empty and which are filled for my unity voxel game object.

I am new to voxel rendering, I have read many articles online but couldn't find anything that which answers my queries.

Below is an example of the voxel model

In each of the voxel, I want to assign a set of {RGBAC}, where R, G, B, and A are the red, blue, green, and alpha components. C defines whether the voxel is empty or filled if C=1 voxel is filled with the game object if C=0 voxel is empty.

The voxel filled with light red color is considered the voxel containing the game object, and the other voxels are considered empty voxels. How could I identify the empty and the filled voxels? I am using C# attached with unity.

CodePudding user response：

In principle a voxel is equivalent to a 3d pixel in a bitmap. So a straightforward way to represent a bunch of voxels would be with a multidimensional array:

public struct MyVoxel{
    public bool IsEmpty {get; init;}
}
...
public MyVoxel[,,] voxels = new MyVoxel[100,100,100];

This give you a easy way to store if a voxel is empty and any other information you want to associate with a voxel. You can then generate graphics objects from your voxels on demand, based on the information stored in the voxel.

The downside with this solution is that it requires a huge amount of memory if you want a large area to play in. Because of this most serious implementations use various tricks to reduce memory usage, like procedurally generating voxels, using various compression schemes etc.

CodePudding user response：

You can use Physics.OverlapBox or Physics.OverlapSphere, but you need to have a collider attached to each gameobject, that you want to detect. Have a look in the docs.