94 lines
2.9 KiB
Go
94 lines
2.9 KiB
Go
/*******************************************************************************************
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*
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* raylib [models] example - Drawing billboards
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*
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* Example originally created with raylib 1.3, last time updated with raylib 3.5
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*
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* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
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* BSD-like license that allows static linking with closed source software
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*
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* Copyright (c) 2015-2024 Ramon Santamaria (@raysan5)
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*
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********************************************************************************************/package main
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import (
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rl "github.com/gen2brain/raylib-go/raylib"
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)
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const (
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screenWidth = 800
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screenHeight = 450
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)
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func main() {
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rl.InitWindow(screenWidth, screenHeight, "raylib [models] example - drawing billboards")
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camera := rl.Camera{}
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camera.Position = rl.NewVector3(5.0, 4.0, 5.0)
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camera.Target = rl.NewVector3(0.0, 2.0, 0.0)
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camera.Up = rl.NewVector3(0.0, 1.0, 0.0)
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camera.Fovy = 45.0
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camera.Projection = rl.CameraPerspective
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bill := rl.LoadTexture("billboard.png") // Our texture billboard
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billPositionStatic := rl.NewVector3(0.0, 2.0, 0.0) // Position of static billboard
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billPositionRotating := rl.NewVector3(1.0, 2.0, 1.0) // Position of rotating billboard
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// Entire billboard texture, source is used to take a segment from a larger texture.
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source := rl.Rectangle{
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Width: float32(bill.Width),
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Height: float32(bill.Height),
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}
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// NOTE: Billboard locked on axis-Y
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billUp := rl.Vector3{Y: 1.0}
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// Set the height of the rotating billboard to 1.0 with the aspect ratio fixed
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size := rl.Vector2{
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X: source.Width / source.Height,
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Y: 1.0,
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}
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// Rotate around origin
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// Here we choose to rotate around the image center
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origin := rl.Vector2Scale(size, 0.5)
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// Distance is needed for the correct billboard draw order
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// Larger distance (further away from the camera) should be drawn prior to smaller distance.
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var distanceStatic, distanceRotating, rotation float32
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rl.SetTargetFPS(60)
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for !rl.WindowShouldClose() {
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// Update
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rl.UpdateCamera(&camera, rl.CameraOrbital) // Update camera with orbital camera mode
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rotation += 0.4
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distanceStatic = rl.Vector3Distance(camera.Position, billPositionStatic)
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distanceRotating = rl.Vector3Distance(camera.Position, billPositionRotating)
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// Draw
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rl.BeginDrawing()
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rl.ClearBackground(rl.RayWhite)
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rl.BeginMode3D(camera)
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rl.DrawGrid(10, 1.0) // Draw a grid
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// Draw order matters!
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if distanceStatic > distanceRotating {
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rl.DrawBillboard(camera, bill, billPositionStatic, 2.0, rl.White)
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rl.DrawBillboardPro(camera, bill, source, billPositionRotating, billUp, size, origin, rotation, rl.White)
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} else {
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rl.DrawBillboardPro(camera, bill, source, billPositionRotating, billUp, size, origin, rotation, rl.White)
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rl.DrawBillboard(camera, bill, billPositionStatic, 2.0, rl.White)
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}
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rl.EndMode3D()
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rl.DrawFPS(10, 10)
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rl.EndDrawing()
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}
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rl.UnloadTexture(bill) // Unload texture
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rl.CloseWindow()
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}
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