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Improve Clouds::render mathematics

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This commit is contained in:
Loic Blot
2015-03-07 13:23:38 +01:00
parent 5698e2baf8
commit a603a76787
1 changed files with 23 additions and 28 deletions
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51
src/clouds.cpp
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@@ -95,13 +95,13 @@ void Clouds::render()
*/
const s16 cloud_radius_i = 12;
const float cloud_size = BS*64;
const v2f cloud_speed(0, -BS*2);
const float cloud_size = BS * 64;
const v2f cloud_speed(0, -BS * 2);
const float cloud_full_radius = cloud_size * cloud_radius_i;
// Position of cloud noise origin in world coordinates
v2f world_cloud_origin_pos_f = m_time*cloud_speed;
v2f world_cloud_origin_pos_f = m_time * cloud_speed;
// Position of cloud noise origin from the camera
v2f cloud_origin_from_camera_f = world_cloud_origin_pos_f - m_camera_pos;
// The center point of drawing in the noise
@@ -160,32 +160,27 @@ void Clouds::render()
// Read noise
bool *grid = new bool[cloud_radius_i*2*cloud_radius_i*2];
bool *grid = new bool[cloud_radius_i * 2 * cloud_radius_i * 2];
for(s16 zi=-cloud_radius_i; zi<cloud_radius_i; zi++)
for(s16 xi=-cloud_radius_i; xi<cloud_radius_i; xi++)
{
u32 i = (zi+cloud_radius_i)*cloud_radius_i*2 + xi+cloud_radius_i;
float cloud_size_noise = cloud_size / BS / 200;
v2s16 p_in_noise_i(
xi+center_of_drawing_in_noise_i.X,
zi+center_of_drawing_in_noise_i.Y
);
for(s16 zi = -cloud_radius_i; zi < cloud_radius_i; zi++) {
u32 si = (zi + cloud_radius_i) * cloud_radius_i * 2 + cloud_radius_i;
#if 0
double noise = noise2d_perlin_abs(
(float)p_in_noise_i.X*cloud_size/BS/200,
(float)p_in_noise_i.Y*cloud_size/BS/200,
m_seed, 3, 0.4);
grid[i] = (noise >= 0.80);
#endif
#if 1
double noise = noise2d_perlin(
(float)p_in_noise_i.X*cloud_size/BS/200,
(float)p_in_noise_i.Y*cloud_size/BS/200,
m_seed, 3, 0.5);
grid[i] = (noise >= 0.4);
#endif
for(s16 xi = -cloud_radius_i; xi < cloud_radius_i; xi++) {
u32 i = si + xi;
v2s16 p_in_noise_i(
xi + center_of_drawing_in_noise_i.X,
zi + center_of_drawing_in_noise_i.Y
);
double noise = noise2d_perlin(
(float)p_in_noise_i.X * cloud_size_noise,
(float)p_in_noise_i.Y * cloud_size_noise,
m_seed, 3, 0.5);
grid[i] = (noise >= 0.4);
}
}
#define GETINDEX(x, z, radius) (((z)+(radius))*(radius)*2 + (x)+(radius))
@@ -230,8 +225,8 @@ void Clouds::render()
}*/
f32 rx = cloud_size/2;
f32 ry = 8*BS;
f32 rz = cloud_size/2;
f32 ry = 8 * BS;
f32 rz = cloud_size / 2;
for(int i=0; i<num_faces_to_draw; i++)
{