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icosphere: adjust lighting

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This commit is contained in:
Zack Buhman 2023-12-25 22:11:53 +08:00
parent 8c5cd36078
commit 1078037226
1 changed files with 17 additions and 15 deletions
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32
example/icosphere.cpp
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@ -80,14 +80,14 @@ void transform(ta_parameter_writer& parameter,
auto& normal = MODEL::normals[normal_ix];
auto n = rotate(normal, theta);
vec4 color = {0.3, 0.3, 0.3, 1.0};
vec4 color = {0.2, 0.2, 0.2, 1.0};
// intensity calculation
{
auto l = lights[0] - point;
auto n_dot_l = dot(n, l);
if (n_dot_l > 0) {
color.x += 0.5 * n_dot_l / (length(n) * length(l));
color.x += 0.6 * n_dot_l / (length(n) * length(l));
}
}
@ -95,7 +95,7 @@ void transform(ta_parameter_writer& parameter,
auto l = lights[1] - point;
auto n_dot_l = dot(n, l);
if (n_dot_l > 0) {
color.y += 0.5 * n_dot_l / (length(n) * length(l));
color.y += 0.6 * n_dot_l / (length(n) * length(l));
}
}
@ -103,7 +103,7 @@ void transform(ta_parameter_writer& parameter,
auto l = lights[2] - point;
auto n_dot_l = dot(n, l);
if (n_dot_l > 0) {
color.z += 0.5 * n_dot_l / (length(n) * length(l));
color.z += 0.6 * n_dot_l / (length(n) * length(l));
}
}
@ -111,12 +111,12 @@ void transform(ta_parameter_writer& parameter,
float y = point.y;
float z = point.z;
x *= 8;
y *= 8;
z *= 8;
x *= 10;
y *= 10;
z *= 10;
// camera transform
z += 15;
z += 20;
// perspective
x = x / z;
@ -182,7 +182,7 @@ void transform2(ta_parameter_writer& parameter,
z += pos.z;
// camera transform
z += 15;
z += 20;
// perspective
x = x / z;
@ -265,14 +265,16 @@ void main()
640 / 32,
480 / 32);
lights[0].x = cos(theta) * 10;
lights[0].z = sin(theta) * 10;
float theta2 = 3.14 * 2 * sin(theta / 7);
lights[1].x = cos(theta + half_degree * 180.f) * 10;
lights[1].z = sin(theta + half_degree * 180.f) * 10;
lights[0].x = cos(theta) * 15;
lights[0].z = sin(theta) * 15;
lights[2].x = cos(theta + half_degree * 360.f) * 10;
lights[2].z = sin(theta + half_degree * 360.f) * 10;
lights[1].x = cos(theta2 + half_degree * 180.f) * 15;
lights[1].z = sin(theta2 + half_degree * 180.f) * 15;
lights[2].x = cos(theta + half_degree * 360.f) * 15;
lights[2].z = sin(theta + half_degree * 360.f) * 15;
auto parameter = ta_parameter_writer(ta_parameter_buf);
for (uint32_t i = 0; i < MODEL::num_faces; i++) {