Welcome to The Bug Genie

for(size_t i = 0; i < entities.size(); i++) { // for all objects on level?
	Entity * ioo = entities[i];
 
	if ((ioo) && (long(i) != numsource) && (ioo->obj))
	{
		if ((i != 0) && (numsource != 0)
		        && validsource && (HaveCommonGroup(ioo, entities[numsource])))
			continue;
 
		if ((ioo->ioflags & IO_CAMERA) || (ioo->ioflags & IO_MARKER)) continue;
 
		long count = 0;
		long count2 = 0;
		float mindist = std::numeric_limits<float>::max();
 
		for (size_t k = 0; k < ioo->obj->vertexlist.size(); k += 1)
		{ // for all vertexes of the object
			if (ioo->obj->vertexlist.size() < 120)
			{ // if the number of vertexes of the object less then 120
				for (size_t kk = 0; kk < ioo->obj->vertexlist.size(); kk += 1)
				{ // for all others vertexes of the object
					if (kk != k)
					{
						Vec3f posi = (entities[i]->obj->vertexlist3[k].v
						              + entities[i]->obj->vertexlist3[kk].v) * 0.5f; // is sought the midpoint between the two vertexes
						float dist = fdist(*pos, posi); // and measured its distance to the center of the explosion
						if(dist <= radius) { // if distance less then radius of explosion
							count2++;
							if (dist < mindist) mindist = dist;
						}
					}
				}
			}
 
			{
				float dist = fdist(*pos, entities[i]->obj->vertexlist3[k].v); // measured distance from vertex to the center of the explosion
 
				if (dist <= radius)
				{ // if distance less then radius of explosion
					count++;
 
					if (dist < mindist) mindist = dist;
				}
			}
		}
 
		float ratio = ((float)count / ((float)ioo->obj->vertexlist.size() * ( 1.0f / 2 ))); // "* ( 1.0f / 2 )" are increases the ratio
 
		if (count2 > count)
			ratio = ((float)count2 / ((float)ioo->obj->vertexlist.size() * ( 1.0f / 2 ))); // "* ( 1.0f / 2 )" are increases the ratio
 
		if (ratio > 2.f) ratio = 2.f;
 
		...
		}
		...
	}
	...
}

for (size_t k = 0; k < ioo->obj->vertexlist.size(); k += 1)
{
	if (ioo->obj->vertexlist.size() < 120)
	{
		for (size_t kk = 0; kk < ioo->obj->vertexlist.size(); kk += 1)
		{
			if (kk != k)
			{
				Vec3f posi = (entities[i]->obj->vertexlist3[k].v
				              + entities[i]->obj->vertexlist3[kk].v) * 0.5f;
				float dist = fdist(*pos, posi);
				if(dist <= radius) {
					count2++;
					if (dist < mindist) mindist = dist;
				}
			}
		}
	}
	else // reduces the number of measurements
	{
		float dist = fdist(*pos, entities[i]->obj->vertexlist3[k].v);
 
		if (dist <= radius)
		{
			count++;
 
			if (dist < mindist) mindist = dist;
		}
	}
}
 
float ratio = ((float)count / ((float)ioo->obj->vertexlist.size() * ( 1.0f / 2 )));
 
if (count2 > count)
	ratio = ((float)count2 / ((float)ioo->obj->vertexlist.size() * ( 1.0f / 2 )));
 
if (ratio > 2.f) ratio = 2.f;

for (size_t k = 0; k < ioo->obj->vertexlist.size(); k += 1)
{
	if (ioo->obj->vertexlist.size() < 120)
	{
		for (size_t kk = 0; kk < ioo->obj->vertexlist.size(); kk += 1)
		{
			if (kk != k)
			{
				Vec3f posi = (entities[i]->obj->vertexlist3[k].v
				              + entities[i]->obj->vertexlist3[kk].v) * 0.5f;
				float dist = fdist(*pos, posi);
				if(dist <= radius) {
					count2++;
					if (dist < mindist) mindist = dist;
				}
			}
		}
	}
	else
	{
		float dist = fdist(*pos, entities[i]->obj->vertexlist3[k].v);
 
		if (dist <= radius)
		{
			count++;
 
			if (dist < mindist) mindist = dist;
		}
	}
}
 
float ratio = ((float)count / (float)ioo->obj->vertexlist.size()); // The less counter, the less damage from the explosion
 
if (count2 > count)
	ratio = ((float)count2 / (float)ioo->obj->vertexlist.size()); // The less counter, the less damage from the explosion
 
if (ratio > 2.f) ratio = 2.f;