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Only apply non-flat-stroke correction in non-zero joint angle vertices

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Grant Sanderson 2024-11-25 12:35:32 -07:00
parent 9cd6a87ff8
commit dd51b696e5
1 changed files with 7 additions and 5 deletions
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12
manimlib/shaders/quadratic_bezier/stroke/geom.glsl
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@ -78,11 +78,13 @@ vec3 step_to_corner(vec3 point, vec3 tangent, vec3 unit_normal, float joint_angl
// lines up very closely with the direction to the camera, treated here // lines up very closely with the direction to the camera, treated here
// as the unit normal. To avoid those, this smoothly transitions to a step // as the unit normal. To avoid those, this smoothly transitions to a step
// direction perpendicular to the true curve normal. // direction perpendicular to the true curve normal.
float alignment = abs(dot(normalize(tangent), unit_normal)); if(joint_angle != 0){
float alignment_threshold = 0.97; // This could maybe be chosen in a more principled way based on stroke width float alignment = abs(dot(normalize(tangent), unit_normal));
if (alignment > alignment_threshold) { float alignment_threshold = 0.97; // This could maybe be chosen in a more principled way based on stroke width
vec3 perp = normalize(cross(v_unit_normal[1], tangent)); if (alignment > alignment_threshold) {
step = mix(step, project(step, perp), smoothstep(alignment_threshold, 1.0, alignment)); vec3 perp = normalize(cross(v_unit_normal[1], tangent));
step = mix(step, project(step, perp), smoothstep(alignment_threshold, 1.0, alignment));
}
} }
if (inside_curve || int(joint_type) == NO_JOINT) return step; if (inside_curve || int(joint_type) == NO_JOINT) return step;