full flower
I'm working on implementing a simple physics engine for learning purposes and I'm struggling to wrap my head around how to resolve a compiler error:
const std = @import("std");
const rl = @import("raylib");
pub const Particle = struct {
position: rl.Vector3,
velocity: rl.Vector3,
mass: f32,
const Self = @This();
pub fn init(rand: std.Random) Self {
const position = .{ .x = rand.float(f32) * 10, .y = rand.float(f32) * 10, .z = rand.float(f32) * 10 };
const velocity = .{ .x = 0, .y = 0, .z = 0 };
const mass = 1;
return .{ .position = position, .velocity = velocity, .mass = mass };
}
pub fn physics_update(self: *Self) void {
const force = self.compute_gravity();
const acceleration: rl.Vector3 = .{ .x = force.x / self.mass, .y = force.y / self.mass, .z = force.z / self.mass };
self.velocity.x += acceleration.x;
self.velocity.y += acceleration.y;
self.velocity.z += acceleration.z;
self.position.x += self.velocity.x;
self.position.y += self.velocity.y;
self.position.z += self.velocity.z;
}
pub fn compute_gravity(self: *Self) rl.Vector3 {
return .{ .x = 0, .y = self.mass * -9.81, .z = 0 };
}
};
pub fn particle_sim() !void {
const particle_count: u8 = 1;
var prng = std.rand.DefaultPrng.init(blk: {
var seed: u64 = undefined;
try std.posix.getrandom(std.mem.asBytes(&seed));
break :blk seed;
});
const rand = prng.random();
const p1 = Particle.init(rand);
const particles = [particle_count]Particle{p1};
const sim_time: u8 = 10;
var current_time: u8 = 0;
while (current_time < sim_time) {
std.time.sleep(1_000_000);
for (&particles) |*p| {
p.physics_update();
}
current_time += 1;
}
}
brittle void
muted radish