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voxel: Add smoothing for height

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This commit is contained in:
Wladimir J. van der Laan 2020-01-12 13:12:04 +00:00
parent e85a074309
commit 7e0b0f05b0
1 changed files with 9 additions and 3 deletions
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12
rust/voxel/src/main.rs
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@ -203,6 +203,7 @@ fn main() -> ! {
let horizon = (DISP_HEIGHT / 2) as f32; // y coordinate of horizon on screen let horizon = (DISP_HEIGHT / 2) as f32; // y coordinate of horizon on screen
let scale_height = 50.0; // Scaling factor for mountain heights let scale_height = 50.0; // Scaling factor for mountain heights
let distance = 256; // Rendering distance let distance = 256; // Rendering distance
let h_frac = 0.8; // Smoothing fraction for height changes
writeln!(stdout, "First frame").unwrap(); writeln!(stdout, "First frame").unwrap();
let mut disp = Display::new(); let mut disp = Display::new();
@ -210,16 +211,21 @@ fn main() -> ! {
let mut p = (0.0, 0.0); let mut p = (0.0, 0.0);
// "Player" rotation // "Player" rotation
let mut phi = 0.0f32; let mut phi = 0.0f32;
// "Player" height
let mut height = 100.0;
loop { loop {
// Orientation to variables for 2D rotation matrix. // Orientation to variables for 2D rotation matrix.
let sinphi = phi.sin(); let sinphi = phi.sin();
let cosphi = phi.cos(); let cosphi = phi.cos();
// Derive current player height from landscape height at the current // Derive current player height from landscape height at the current
// position. // position.
// XXX: it'd be nice to apply some kind of low-pass filter here // Apply low-pass filter here to prevent ugly sudden jumps, while not flying into mountains.
// to prevent ugly sudden jumps, while not lying into mountains.
let (_, p_depth) = map.sample(p.0, p.1); let (_, p_depth) = map.sample(p.0, p.1);
let height = fmax(p_depth as f32 + 20.0, 50.0); let tgt_height = fmax(p_depth as f32 + 20.0, 50.0);
height = height * h_frac + tgt_height*(1.0 - h_frac);
if height < (p_depth as f32) {
height = p_depth as f32;
}
// Render landscape! // Render landscape!
let mut ybuffer = [DISP_HEIGHT as i32; DISP_WIDTH as usize]; let mut ybuffer = [DISP_HEIGHT as i32; DISP_WIDTH as usize];
for z in 1..distance { for z in 1..distance {