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Add stand in for a ribboning effect

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This commit is contained in:
Grant Sanderson 2024-08-05 13:37:34 -05:00
parent c61c18486c
commit f363eaa2fd
1 changed files with 10 additions and 0 deletions
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10
manimlib/shaders/quadratic_bezier_stroke/geom.glsl
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@ -147,6 +147,16 @@ void emit_point_with_width(
// triangle strip around the polyline
vec3 step = step_to_corner(point, unit_tan, unit_normal, unit_jp, inner_joint);
// TODO, this gives a somewhat nice effect that's like a ribbon mostly with its
// broad side to the camera. Currently unused by VMobject
if(flat_stroke == 2.0){
// Rotate the step towards the unit normal by an amount depending
// on the camera position
float cos_angle = dot(unit_normal, normalize(camera_position));
float sin_angle = sqrt(max(1 - cos_angle * cos_angle, 0));
step = cos_angle * step + sin_angle * unit_normal;
}
// Set styling
color = finalize_color(joint_color, point, unit_normal);
if (width == 0) scaled_anti_alias_width = -1.0; // Signal to discard in frag