▸case-01 I am implementing a 2-segment arm IK solver in C# for a character's arm consisting of upper arm length L1 and lower arm length L2, aiming at target distance D. I'm tempted to use simple linear interpolation for the joint angle. How should the interior elbow joint angle be calculated geometrically? | pass→pass | 14,245 | 17,191 | +21% | 1 | 1 | 0% | 2,790 | 2,737 | -2% | 0 | 0 | — |
▸case-02 When implementing the Forward And Backward Reaching Inverse Kinematics algorithm for a 4-joint chain, should the backward pass start from the end effector moving towards the root or from the root moving towards the end effector? | pass→fail | 12,103 | 10,223 | -16% | 1 | 1 | 0% | 2,141 | 1,853 | -13% | 0 | 0 | — |
▸case-03 In a Cyclic Coordinate Descent (CCD) IK solver for a robot tentacle, I want to update each joint's rotation in a single iteration step. Should I compute the rotation from the current joint to the end effector and target, or calculate a global matrix inversion? | pass→pass | 13,451 | 15,079 | +12% | 1 | 1 | 0% | 2,255 | 2,210 | -2% | 0 | 0 | — |
▸case-04 I am writing a procedural foot placement script for a character walking on uneven terrain. I'm tempted to just move the foot's Y position to match the ground height raycast hit point. What else must be aligned to prevent the foot from clipping into slopes? | pass→pass | 15,708 | 15,373 | -2% | 1 | 1 | 0% | 2,142 | 2,600 | +21% | 0 | 0 | — |
▸case-05 In a 4-legged procedural locomotion system, I want to compute the vertical lift of a foot during its swing phase. Someone suggested linear interpolation from 0 to max height and back to 0. What curve function should be used for smooth lifting and landing during swing phase t in [0, 1]? | pass→pass | 21,705 | 19,097 | -12% | 1 | 1 | 0% | 3,245 | 2,806 | -14% | 0 | 0 | — |
▸case-06 When both feet of a biped character are planted on uneven terrain with one foot higher than the other, should the root/pelvis position remain at its base capsule height or adapt? | pass→pass | 12,577 | 15,198 | +21% | 1 | 1 | 0% | 1,853 | 2,067 | +12% | 0 | 0 | — |
▸case-07 In an active ragdoll physics character where rigidbodies match a target animation pose, should I force transform positions directly via teleports or calculate joint torques? | pass→pass | 15,079 | 14,118 | -6% | 1 | 1 | 0% | 2,153 | 2,063 | -4% | 0 | 0 | — |
▸case-08 I want to implement jiggle physics for a character's dynamic tail bones. I'm thinking of setting bone positions using a basic delay lerp. What differential physical model handles spring oscillation and damping without unbounded accumulation? | pass→fail | 20,139 | 21,725 | +8% | 1 | 1 | 0% | 2,898 | 3,258 | +12% | 0 | 0 | — |
▸case-09 In a 3D leg IK chain, the hip and foot positions are fixed, but the knee snaps unpredictably or flips when the target moves behind the character. What structure should be passed to the IK solver to constrain the bending direction? | pass→pass | 8,950 | 9,910 | +11% | 1 | 1 | 0% | 1,196 | 1,700 | +42% | 0 | 0 | — |
▸case-10 When controlling a multi-joint robotic arm near singular configurations using Jacobian Inverse IK, simple pseudoinverse matrix inversion causes extreme joint velocity spikes. What mathematical adjustment stabilizes the solver near singularities? | pass→pass | 11,606 | 16,757 | +44% | 1 | 1 | 0% | 2,136 | 2,287 | +7% | 0 | 0 | — |
▸case-11 In procedural walking without pre-baked animation clips, if the character's movement velocity doubles, keeping stride length fixed causes a fast paddling effect. How should stride parameters scale relative to character speed? | pass→pass | 18,429 | 21,730 | +18% | 1 | 1 | 0% | 2,963 | 3,153 | +6% | 0 | 0 | — |
▸case-12 For secondary motion of dynamic hair strands or dynamic ropes, I want a lightweight particle physics approach that enforces distance constraints between points without requiring full heavy rigidbodies. What integration scheme is standard here? | pass→pass | 16,025 | 17,521 | +9% | 1 | 1 | 0% | 2,853 | 2,614 | -8% | 0 | 0 | — |
▸case-13 In a procedural quadruped trot gait model, which pairs of legs move in phase sync during the gait cycle? | pass→pass | 5,706 | 4,741 | -17% | 1 | 1 | 0% | 790 | 842 | +7% | 0 | 0 | — |
▸case-14 When a character suddenly stops moving, the hair and cape attached to dynamic spring bones should swing forward and settle. What property drives this motion relative to the root acceleration? | pass→pass | 8,315 | 10,874 | +31% | 1 | 1 | 0% | 1,379 | 1,570 | +14% | 0 | 0 | — |
▸case-15 In two-bone leg IK, after calculating the interior knee angle via law of cosines, how is the upper leg thigh orientation angle calculated relative to the vector from hip to target? | pass→pass | 13,394 | 16,344 | +22% | 1 | 1 | 0% | 2,420 | 2,514 | +4% | 0 | 0 | — |
▸case-16 In secondary motion spring solvers, what value of damping ratio zeta prevents overshoot while returning the spring to resting position as fast as possible? | pass→pass | 5,998 | 4,507 | -25% | 1 | 1 | 0% | 964 | 596 | -38% | 0 | 0 | — |
▸case-17 In a 2-segment limb IK solver where total length is L1 + L2, if the target is placed farther than L1 + L2, how should the solver handle the target point to avoid NaN trigonometric errors? | pass→pass | 16,222 | 11,748 | -28% | 1 | 1 | 0% | 2,596 | 2,017 | -22% | 0 | 0 | — |
▸case-18 In procedural locomotion, when transitioning a leg from swing phase to stance phase upon ground contact detection, what state change occurs for the foot target location? | pass→pass | 8,599 | 8,734 | +2% | 1 | 1 | 0% | 1,077 | 1,287 | +19% | 0 | 0 | — |
▸case-19 For procedural secondary cape movement under environmental wind forces, how should the aerodynamic force vector be calculated relative to the cape surface mesh polygon normal? | pass→pass | 26,677 | 32,757 | +23% | 1 | 1 | 0% | 3,954 | 4,873 | +23% | 0 | 0 | — |
▸case-20 When applying a procedural head/spine Look-At IK solver to turn a character toward an off-screen target, applying 100% of the rotation to the neck joint creates unnatural neck snapping. How should rotation be distributed down the spine bone hierarchy? | pass→pass | 20,627 | 18,119 | -12% | 1 | 1 | 0% | 2,784 | 2,629 | -6% | 0 | 0 | — |
▸case-21 I have two pre-baked FBX keyframe clips (Walk_Loop.anim and Run_Loop.anim) in my unity project. I want to transition smoothly between them over 0.3 seconds as the character accelerates, without generating any runtime IK or physics adjustments. How should this clip transition be configured in the animation controller? | pass→pass | 14,885 | 13,509 | -9% | 1 | 1 | 0% | 2,517 | 2,031 | -19% | 0 | 0 | — |
▸case-22 I am building a 2D pixel-art game in Godot. I have a 12-frame running spritesheet PNG. I want the character's feet to animate as the player moves left and right. How should I set up the animation node for playing this sprite sequence? | fail→fail | 14,125 | 12,415 | -12% | 1 | 1 | 0% | 2,527 | 2,383 | -6% | 0 | 0 | — |
▸case-23 I need to set up a cutscene camera in Unreal Engine that follows a predefined curved track through a building. I want to author the exact camera track in Sequencer using Bezier control points before runtime. What tool or track type handles this fixed path trajectory? | pass→pass | 14,582 | 7,006 | -52% | 1 | 1 | 0% | 1,861 | 927 | -50% | 0 | 0 | — |