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What are the UV coordinates for a 2D texture?
Recall that UV coordinates range from zero to one for both U and V. The screen is just a 2D texture UV mapped over a screen-sized rectangle. Knowing this, the example code doesn’t actually need the final rendering of the scene to compute the refraction. It can instead calculate what UV coordinate each screen pixel will eventually use.
Can You refract light with normal mapped normals?
Here you see the water refracting the light with and without normal maps. If available, be sure to use the normal mapped normals instead of the vertex normals. The smoother and flatter the surface, the harder it is to tell the light is being refracted.
What happens when you refract a ray on a screen?
As it was with screen space reflection, the screen doesn’t have the entire geometry of the scene. A refracted ray may march through the screen space and never hit a captured surface. Or it may hit a surface but it’s the backside not captured by the camera. When this happened during reflection, the fragment was left blank.
What’s the difference between screen space refraction and SSAO?
Screen space reflection and screen space refraction work almost identically expect for one major difference. Instead of using the reflected vector, screen space refraction uses the refracted vector. It’s a slight change in code but a big difference visually. Like SSAO, you’ll need the vertex positions in view space.
How are the properties of a texture specified?
Texture properties are specified using the glTexParameter family of functions. Before you can modify the properties of a texture, you must first bind the texture to an appropriate texture target. To bind a texture to a texture target, you use the glBindTexture method.
Do you need shader variants for HDR mode?
We need shader variants for all possible light configurations. The multi_compile_lightpasscompiler directive creates all keyword combinations that we need. The only exception is HDR mode. We have to add a separate multi-compile directive for that.
What’s the name of the deferred shader in Unity?
But the lights are rendered with Unity’s default deferred shader, which is named Hidden / Internal-DefferedShader. You can verify this by going to the graphics settings via Edit / Project Settings / Graphicsand switching the Deferredshader mode to Custom shader.