public void Render(int startIndex, int count)
{
MaterialFactory.GetMaterial(
PlatformRenderer.Blending,
PlatformRenderer.ZTest,
PlatformRenderer.ZWrite,
PlatformRenderer.Shader,
PlatformRenderer.Textures[0],
PlatformRenderer.Textures[1]
).SetPass(0);
// unityMesh.Clear(true);
UploadVertices();
var indices = new int[count];
Array.Copy(source.Indices, startIndex, indices, 0, count);
unityMesh.triangles = indices;
PlatformRenderer.SetViewportAndProject();
UnityEngine.Graphics.DrawMeshNow(unityMesh, UnityEngine.Matrix4x4.identity);
}