True Mirror Needed

Unity Engine
1

Hi,

I want to implement a rectangular ground object that reflects like a mirror.

Is there a way to do that? I’m using Unity 3.5.6/4.0.0 Pro and want to deploy to iOS.

Thx ia,

Ekki

2

Take a look at Unity Pro’s built in water system. Basically what you need to do is render the scene one more time with a different camera. Code excerpt from Unity’s water:

		// Render reflection if needed
		if( mode >= WaterMode.Reflective )
		{
			// Reflect camera around reflection plane
			float d = -Vector3.Dot (normal, pos) - m_ClipPlaneOffset;
			Vector4 reflectionPlane = new Vector4 (normal.x, normal.y, normal.z, d);
		
			Matrix4x4 reflection = Matrix4x4.zero;
			CalculateReflectionMatrix (ref reflection, reflectionPlane);
			Vector3 oldpos = cam.transform.position;
			Vector3 newpos = reflection.MultiplyPoint( oldpos );
			reflectionCamera.worldToCameraMatrix = cam.worldToCameraMatrix * reflection;
		
			// Setup oblique projection matrix so that near plane is our reflection
			// plane. This way we clip everything below/above it for free.
			Vector4 clipPlane = CameraSpacePlane( reflectionCamera, pos, normal, 1.0f );
			Matrix4x4 projection = cam.projectionMatrix;
			CalculateObliqueMatrix (ref projection, clipPlane);
			reflectionCamera.projectionMatrix = projection;
			
			reflectionCamera.cullingMask = ~(1<<4)  m_ReflectLayers.value; // never render water layer
			reflectionCamera.targetTexture = m_ReflectionTexture;
			GL.SetRevertBackfacing (true);
			reflectionCamera.transform.position = newpos;
			Vector3 euler = cam.transform.eulerAngles;
			reflectionCamera.transform.eulerAngles = new Vector3(-euler.x, euler.y, euler.z);
			reflectionCamera.Render();
			reflectionCamera.transform.position = oldpos;
			GL.SetRevertBackfacing (false);
			renderer.sharedMaterial.SetTexture( "_ReflectionTex", m_ReflectionTexture );
		}