Unity Icon Generator at runtime

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Jun 12th, 2022

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class IconGenerator : MonoBehaviour
{
[SerializeField] int _textureSize = 256;
[SerializeField] GameObject _targetObject;
[SerializeField] Camera _iconCam;
[SerializeField] Image _outputImage;
[SerializeField] LayerMask _layerMask;
[SerializeField] bool _destroyCopy = true;
GameObject _copyObject;
Bounds _objectBounds;
RenderTexture _renderTex;
IEnumerator _generateTextureCoroutine;
private void Start() {
_renderTex = new RenderTexture(_textureSize, _textureSize, 0);
_iconCam.targetTexture = _renderTex;
_iconCam.cullingMask = _layerMask;
}
public void OnClickGenerateIcon() {
Debug.Log("Generating new icon");
if (_copyObject != null)
Destroy(_copyObject);
_copyObject = Instantiate(_targetObject);
SetCenterPoint();
_copyObject.transform.SetParent(transform);
_copyObject.transform.localPosition = -_objectBounds.center;
_copyObject.transform.localRotation = Quaternion.identity;
FitCameraToObjectBounds();
int layer = LayerMask.NameToLayer("Icon Generator");
SetLayerToChildren(_copyObject, layer);
// start coroutine to generate a sprite from a texture
if (_generateTextureCoroutine != null)
StopCoroutine(_generateTextureCoroutine);
_generateTextureCoroutine = GetSpriteFromTexture();
StartCoroutine(_generateTextureCoroutine);
}
void SetCenterPoint() {
MeshRenderer[] renderers = _copyObject.GetComponentsInChildren<MeshRenderer>();
_objectBounds = new Bounds(_copyObject.transform.position, Vector3.zero);
for (int i = 0; i < renderers.Length; i++) {
_objectBounds.Encapsulate(renderers[i].bounds);
}
}
void FitCameraToObjectBounds() {
float maxSide = _objectBounds.size.z > _objectBounds.size.y ? _objectBounds.size.z : _objectBounds.size.y;
_iconCam.orthographicSize = maxSide * 0.6f; // 0.5 will fit the icon perfectly, 0.6 to have some free space around the object
}
IEnumerator GetSpriteFromTexture() {
yield return new WaitForEndOfFrame();
Texture2D texture = RenderTextureToTexture2D(_renderTex);
Sprite sprite = Sprite.Create(texture, new Rect(0f, 0f, texture.width, texture.height), new Vector2(0.5f, 0.5f));
_outputImage.sprite = sprite;
if (_destroyCopy)
Destroy(_copyObject);
}
void SetLayerToChildren(GameObject targetObj, int layer) {
targetObj.layer = layer;
foreach(Transform child in targetObj.transform) {
SetLayerToChildren(child.gameObject, layer);
}
}
Texture2D RenderTextureToTexture2D(RenderTexture renderTex) {
Texture2D destination = new Texture2D(renderTex.width, renderTex.height, TextureFormat.RGBA32, false);
destination.Apply();
Graphics.CopyTexture(renderTex, destination);
return destination;
}
}

RAW Paste Data Copied

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class IconGenerator : MonoBehaviour
{
    [SerializeField] int _textureSize = 256;
    [SerializeField] GameObject _targetObject;
    [SerializeField] Camera _iconCam;
    [SerializeField] Image _outputImage;
    [SerializeField] LayerMask _layerMask;
    [SerializeField] bool _destroyCopy = true;

GameObject _copyObject;
    Bounds _objectBounds;
    RenderTexture _renderTex;

IEnumerator _generateTextureCoroutine;

private void Start() {
        _renderTex = new RenderTexture(_textureSize, _textureSize, 0);
        _iconCam.targetTexture = _renderTex;
        _iconCam.cullingMask = _layerMask;
    }

public void OnClickGenerateIcon() {
        Debug.Log("Generating new icon");

if (_copyObject != null)
            Destroy(_copyObject);

_copyObject = Instantiate(_targetObject);

SetCenterPoint();

_copyObject.transform.SetParent(transform);
        _copyObject.transform.localPosition = -_objectBounds.center;
        _copyObject.transform.localRotation = Quaternion.identity;

FitCameraToObjectBounds();

int layer = LayerMask.NameToLayer("Icon Generator");
        SetLayerToChildren(_copyObject, layer);

// start coroutine to generate a sprite from a texture
        if (_generateTextureCoroutine != null)
            StopCoroutine(_generateTextureCoroutine);
        _generateTextureCoroutine = GetSpriteFromTexture();
        StartCoroutine(_generateTextureCoroutine);
    }

void SetCenterPoint() {
        MeshRenderer[] renderers = _copyObject.GetComponentsInChildren<MeshRenderer>();

_objectBounds = new Bounds(_copyObject.transform.position, Vector3.zero);

for (int i = 0; i < renderers.Length; i++) {
            _objectBounds.Encapsulate(renderers[i].bounds);
        }
    }

void FitCameraToObjectBounds() {

float maxSide = _objectBounds.size.z > _objectBounds.size.y ? _objectBounds.size.z : _objectBounds.size.y;
        _iconCam.orthographicSize = maxSide * 0.6f;     // 0.5 will fit the icon perfectly, 0.6 to have some free space around the object
    }

IEnumerator GetSpriteFromTexture() {
        yield return new WaitForEndOfFrame();

Texture2D texture = RenderTextureToTexture2D(_renderTex);
        Sprite sprite = Sprite.Create(texture, new Rect(0f, 0f, texture.width, texture.height), new Vector2(0.5f, 0.5f));

_outputImage.sprite = sprite;

if (_destroyCopy)
            Destroy(_copyObject);
    }

void SetLayerToChildren(GameObject targetObj, int layer) {
        targetObj.layer = layer;

foreach(Transform child in targetObj.transform) {
            SetLayerToChildren(child.gameObject, layer);
        }
    }

Texture2D RenderTextureToTexture2D(RenderTexture renderTex) {
        Texture2D destination = new Texture2D(renderTex.width, renderTex.height, TextureFormat.RGBA32, false);
        destination.Apply();
        Graphics.CopyTexture(renderTex, destination);
        return destination;
    }
}