void DrawOnTexture(RaycastHit _hit)
{
int ID = 0;
Renderer currentRend;
ID = _hit.transform.gameObject.GetInstanceID();
currentRend = _hit.transform.GetComponent <Renderer>();
//Create a new Paint Texture if it doesn't exist
if (!paintObjects.ContainsKey(ID))
{
Paint paint = new Paint((int)mappingResolution, (int)mappingResolution, initColors);
paintObjects.Add(ID, paint);
}
if (currentRend && paintObjects[ID] != null)
{
float size = activeBrush ? brushSize : eraserSize;
if (oldSize != size)
{
oldSize = size;
size *= ratio;
//Set Temporary Texture to rescale
TextureScale.CopyTexture(activeBrush ? brushTexture : eraserTexture, ref tempBrush);
TextureScale.Bilinear(tempBrush, (int)(brushTexture.width * size), (int)(brushTexture.height * size));
halfWidth = (int)((brushTexture.width * 0.5f) * size);
halfHeight = (int)((brushTexture.height * 0.5f) * size);
}
// local position on the lightmap texture
int XLightMap = (int)((_hit.lightmapCoord.x) * paintObjects[ID].TmpPaint.width) - halfWidth;
int YLightMap = (int)((_hit.lightmapCoord.y) * paintObjects[ID].TmpPaint.height) - halfHeight;
for (int i = 0; i < tempBrush.width; i++)
{
for (int j = 0; j < tempBrush.height; j++)
{
float alpha = tempBrush.GetPixel(i, j).a;
if (alpha > 0.0f)
{
int XPixel = i + XLightMap;
int YPixel = j + YLightMap;
//out of bounds texture
if (XPixel >= 0 && XPixel < paintObjects[ID].TmpPaint.width - 1 &&
YPixel >= 0 && YPixel < paintObjects[ID].TmpPaint.height - 1)
{
//paint on the mask(white or black)
brushColor.a = alpha;
eraserColor.a = alpha;
paintObjects[ID].TmpPaint.SetPixel(XPixel, YPixel, activeBrush ? brushColor : eraserColor);
}
}
}
}
//Apply to the corresponding material
MaterialPropertyBlock mbp = new MaterialPropertyBlock();
paintObjects[ID].TmpPaint.Apply();
mbp.SetTexture("_PaintTex", paintObjects[ID].TmpPaint);
currentRend.SetPropertyBlock(mbp);
}
}