/// <summary>
/// This method was introduced as a workaround for too aggressive submesh draw call batching,
/// leading to incorrect draw order when 3+ materials are used at submeshes in alternating order.
/// Otherwise, e.g. when using Lightweight Render Pipeline, deliberately separated draw calls
/// "A1 B A2" are reordered to "A1A2 B", regardless of batching-related project settings.
/// </summary>
private void SetMaterialSettingsToFixDrawOrder()
{
if (reusedPropertyBlock == null)
{
reusedPropertyBlock = new MaterialPropertyBlock();
}
bool hasPerRendererBlock = meshRenderer.HasPropertyBlock();
if (hasPerRendererBlock)
{
meshRenderer.GetPropertyBlock(reusedPropertyBlock);
}
for (int i = 0; i < meshRenderer.sharedMaterials.Length; ++i)
{
if (!meshRenderer.sharedMaterials[i])
{
continue;
}
if (!hasPerRendererBlock)
{
meshRenderer.GetPropertyBlock(reusedPropertyBlock, i);
}
// Note: this parameter shall not exist at any shader, then Unity will create separate
// material instances (not in terms of memory cost or leakage).
reusedPropertyBlock.SetFloat(SUBMESH_DUMMY_PARAM_ID, i);
meshRenderer.SetPropertyBlock(reusedPropertyBlock, i);
meshRenderer.sharedMaterials[i].enableInstancing = false;
}
}
