Example of box2d raycasting and meshes for 2d light for Defold game engine.
Raycasting rays from light source. Then update mesh based on raycasting result.Then draw light meshes.
Check this light in game Ninja Mouse
Based on fork of libgdx-box2dlights Fork added dynamic rays to light source to make light smooth. https://www.youtube.com/watch?v=24XHJPjpxy4
This is demo project not library because i think it is not ready to be library, but you can copy code and use it in you projects.
In this example i load level from tiled. More info here
If you like that. You can support me on patreon. It will help me make more items for defold.
- Point light(360 degree)
- Cone light(1-359 degree)
Can't change number of rays in runtime. Because mesh created once. Use bigger value for dynamic rays.
Light have:
- Position
- Angle
- Color
- Radius
- Rays(static)
- Rays(dynamic)
- ...
game = {}
---@class GameNativeLight
local GameNativeLight = {
}
function GameNativeLight:SetPosition(x,y) end
function GameNativeLight:SetAngle(angle) end
function GameNativeLight:SetColor(r, g, b, a) end
function GameNativeLight:SetRadius(radius) end
function GameNativeLight:SetRaysStatic(rays) end
function GameNativeLight:SetRaysDynamic(rays) end
function GameNativeLight:SetBaseAngles(angle_begin, angle_end) end
function GameNativeLight:PlayerIsHit() end
function GameNativeLight:BufferInit() end
function GameNativeLight:GetBuffer() end
function GameNativeLight:SetPhysicsScale(scale) end
function GameNativeLight:SetPlayerIsHit(hit) end
function GameNativeLight:UpdateHitPlayer(px, py, pw, ph) end
function GameNativeLight:SetStartDrawFraction(startDrawFraction) end
function GameNativeLight:UpdateLight() end
function GameNativeLight:Destroy() end
---@return GameNativeLight
function game.create_light() end
function game.set_world(world) end
function game.set_filter_geometry(filter) end
function game.set_filter_player(filter) end
- Draw bg. Before light
- Draw light to light map render target
- If need it. Blur light map render target in blur render target
- Draw light map to screen. With custom blend and custom material.In material mix light color with ambient color.Ambient color is a color which we see if no light.
render.enable_texture(0, self.targets.light_map.target, render.BUFFER_COLOR_BIT)
render.set_blend_func(render.BLEND_ONE, render.BLEND_ONE_MINUS_SRC_ALPHA)
render.enable_material("shadow")
render.draw(self.predicates.model_light_map, self.constants_buffers.shadows)
render.disable_material()- Draw sprites that on top of light. Tiles