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Dev Log: Quick Lighting Test

As a quick experiment I wanted to see how Otter would be equipped to handle a simple lighting set up. The basic set up is just a big render texture that is filled with a dark color with a blend mode set to multiply. Then light is rendered to the render texture with a blend mode of additive. The result is a layer of shadow that can have light rendered to it.

The code for this set up right now is pretty straight forward as well. I'm using a black and white image for the light. Just a black rectangle with a white radial gradient in the center.

Here's some sample code to show how this effect is achieved with Otter!

//set up the surface

public Surface SurfaceLighting = new Surface(Game.Instance.Width, Game.Instance.Height, new Color("379")) {

    Blend = BlendMode.Multiply

};



//set up the light

public Image ImageLight = new Image(Assets.ImageLight1) {

    Blend = BlendMode.Add

};



//add the surface to an entity to render it

//this happens in an object's initialization

AddGraphicGUI(SurfaceLighting);



//render light to the surface

//this happens in a Render() function

Draw.SetTarget(SurfaceLighting);

ImageLight.Color = Color.White;

Draw.Graphic(ImageLight, Input.MouseX, Input.MouseY);

ImageLight.Color = Color.Red;

Draw.Graphic(ImageLight, Input.MouseX + 500, Input.MouseY);

ImageLight.Color = Color.Blue;

Draw.Graphic(ImageLight, Input.MouseX - 500, Input.MouseY);

Draw.ResetTarget();