| What is the Grading Function article about? | It explains how HELIOS 3D can create a graded surface beneath selected PV arrays by cutting and/or filling terrain areas based on the distances to racks in an existing PV layout. The goal is to achieve required module clearance without lifting arrays. (Helios 3D | HELP CENTER) |
| Where is the Grading Function topic located? | It is part of the vertical menu workflow under Overview of Commands > Vertical Menu > Tools > Grading Function. (Helios 3D | HELP CENTER) |
| What is the main purpose of the Grading Function? | The main purpose is to modify the DTM surface below already placed arrays so that module-to-terrain clearance conflicts can be resolved by grading the ground instead of changing array heights. (Helios 3D | HELP CENTER) |
| What does the grading process create? | It creates a new graded surface beneath selected arrays and integrates the graded zones with the original surface. The generated surface is a standard Civil 3D TIN surface. (Helios 3D | HELP CENTER) |
| Which array types are supported by the grading function? | Starting with version 2024, fixed-tilt arrays and trackers are supported. East-west racks are not supported according to the article. (Helios 3D | HELP CENTER) |
| Are east-west racks supported by the grading function? | No. The article explicitly states that fixed-tilt arrays and trackers are supported from version 2024, but east-west racks are not included. (Helios 3D | HELP CENTER) |
| What prerequisite is required before using grading? | A PV layout must already exist, and it must be created without height adjustments to arrays that have module-DTM clearance conflicts. (Helios 3D | HELP CENTER) |
| Why should the original PV layout be created without height adjustments? | This ensures that placement on the new graded surface matches the original layout. The grading process should modify the surface, not change the array positions or heights in the initial layout. (Helios 3D | HELP CENTER) |
| Which placement options are recommended before grading? | Configure the module distance to the DTM, select Insert Always, and leave Adjust unchecked. This keeps the original layout unchanged even if clearance conflicts exist. (Helios 3D | HELP CENTER) |
Why should Insert Always be selected? | Insert Always allows the original layout to be inserted even if module-DTM clearance conflicts exist, which is required so the grading function can later create a suitable graded surface beneath the arrays. (Helios 3D | HELP CENTER) |
Why should Adjust remain unchecked? | Leaving Adjust unchecked prevents HELIOS 3D from lifting or adjusting arrays to resolve clearance conflicts before grading. This keeps the layout unchanged for surface grading. (Helios 3D | HELP CENTER) |
| What example is given for array height and module-DTM distance? | The article gives an example where the array height is set to 0.8 m in the array definition and the module-DTM distance is configured to 0.50 m. The layout keeps these specifications without adjustments. (Helios 3D | HELP CENTER) |
| Where is the grading function started? | The grading function is found under the Tools menu. (Helios 3D | HELP CENTER) |
| What does the user select when creating a grading zone? | The user selects a group of arrays. These arrays must be directly adjacent to each other. (Helios 3D | HELP CENTER) |
| Do selected arrays need to be directly adjacent? | Yes. The article states that selected arrays must be directly adjacent. If arrays are farther apart, multiple grading operations must be performed sequentially. (Helios 3D | HELP CENTER) |
| What should I do if arrays are farther apart? | Perform multiple grading operations sequentially, because each grading operation requires directly adjacent arrays. (Helios 3D | HELP CENTER) |
| What is a grading zone? | A grading zone is created from a selected group of adjacent arrays. Each group forms a separate grading zone, similar to an island, which is then integrated with the original surface. (Helios 3D | HELP CENTER) |
| Can one project contain multiple grading zones? | Yes. Each selected group of arrays forms a separate grading zone. If the array groups are separated, multiple grading operations can create multiple zones. (Helios 3D | HELP CENTER) |
What does Distance to DTM From define? | It defines whether cut and fill distances are measured from the top edge or bottom edge of the module. These reference values are determined by the array definition properties and cannot be modified in the grading dialog. (Helios 3D | HELP CENTER) |
| Can the top or bottom module edge values be changed in the grading dialog? | No. The article states that these values are determined by the array definition properties and cannot be modified in the grading dialog. (Helios 3D | HELP CENTER) |
| How does the preview show the selected reference edge? | The preview on the right visually indicates the selected edge by highlighting it in white. (Helios 3D | HELP CENTER) |
What does Ground Clearance define? | Ground Clearance sets the distance for cut and fill operations. Areas closer than the specified distance are cut, while areas farther away are filled. (Helios 3D | HELP CENTER) |
| How does HELIOS 3D decide whether to cut or fill? | Areas closer than the specified ground clearance are cut. Areas farther away than the specified distance are filled. (Helios 3D | HELP CENTER) |
| What grading modes are available? | The available modes are Cut Only, Fill Only, and Cut and Fill, where both operations are performed simultaneously. (Helios 3D | HELP CENTER) |
When should I use Cut Only? | Use Cut Only when the surface should only be lowered in areas where terrain is too close to the rack or module reference edge. This follows the documented cut/fill logic, but the article does not give a separate project example for this mode. (Helios 3D | HELP CENTER) |
When should I use Fill Only? | Use Fill Only when the surface should only be raised in areas where the terrain is farther away than the configured clearance distance. This follows the documented fill logic, but the article does not give a separate project example for this mode. (Helios 3D | HELP CENTER) |
When should I use Cut and Fill? | Use Cut and Fill when both lowering and raising terrain areas should be performed in one grading operation. The article describes this mode as performing both operations simultaneously. (Helios 3D | HELP CENTER) |
| What is an embankment in the grading function? | An embankment creates a smooth transition between grading zones and the original surface. (Helios 3D | HELP CENTER) |
| What is fixed in the embankment calculation? | The embankment rise is fixed at 1 meter. The run can be adjusted to calculate the angle and gradient. (Helios 3D | HELP CENTER) |
| What happens when the embankment angle or gradient is changed? | When either the angle or gradient is changed, the other value and the run are recalculated automatically. (Helios 3D | HELP CENTER) |
What does Distance to Begin Embankment define? | It sets the starting distance from the arrays so that the embankment edge does not align directly with the array edges. (Helios 3D | HELP CENTER) |
Why is Distance to Begin Embankment useful? | It prevents the embankment edge from starting exactly at the array edges, creating a more controlled transition zone around the graded area. (Helios 3D | HELP CENTER) |
What does Run Length of Embankment define? | It limits the maximum length of the embankment to prevent overly long transitions, especially when the angle is shallow. (Helios 3D | HELP CENTER) |
| Why might an embankment become too long? | An embankment can become overly long if the angle is too shallow. The run length limit prevents excessively long transition areas. (Helios 3D | HELP CENTER) |
What does Show do in the grading settings? | Show displays temporary polylines representing the set distances for the embankment, providing a visual reference for the grading layout. (Helios 3D | HELP CENTER) |
| Are the displayed embankment polylines permanent objects? | The article describes them as temporary polylines used as a visual reference. It does not state that they are permanent drawing objects. (Helios 3D | HELP CENTER) |
| How is the grading surface generated? | The grading surface is generated from the selected grading zones by integrating cut and fill operations into a smooth adjusted surface beneath the arrays. (Helios 3D | HELP CENTER) |
| What type of surface is created by the grading function? | The generated surface is a standard TIN, or Triangulated Irregular Network, surface. (Helios 3D | HELP CENTER) |
| Where is the generated grading surface displayed? | It is displayed in Autodesk Civil 3D Toolspace and in the placement list of the HELIOS 3D Palette. (Helios 3D | HELP CENTER) |
| Can the graded surface be used as the HELIOS 3D surface? | Yes. The graded surface can be set as the HELIOS 3D surface using the context-menu command To Helios3D surface. (Helios 3D | HELP CENTER) |
| How do I set the graded surface as the HELIOS 3D surface? | Right-click the graded surface in the context menu and select To Helios3D surface. (Helios 3D | HELP CENTER) |
| What happens when the graded surface is set as the HELIOS 3D surface? | The existing PV layout is reset, placements then use the graded surface, and the original surface is displayed as an alternative DTM. (Helios 3D | HELP CENTER) |
| Does using the graded surface reset the existing PV layout? | Yes. The article states that setting the graded surface as the HELIOS 3D surface resets the existing PV layout. (Helios 3D | HELP CENTER) |
| What happens to the original surface after switching to the graded surface? | The original surface is displayed as an alternative DTM after the graded surface becomes the HELIOS 3D surface. (Helios 3D | HELP CENTER) |
| Why is the original surface shown as an alternative DTM? | It allows users to keep the original terrain available for comparison while placements use the new graded surface. This comparison purpose is plausible from the documented behavior, but the article does not explicitly explain the reason. (Helios 3D | HELP CENTER) |
| What should I check before setting the graded surface as the HELIOS 3D surface? | Check that the generated grading surface is correct, because assigning it with To Helios3D surface resets the existing PV layout and makes placements use the graded surface. (Helios 3D | HELP CENTER) |
| What special rule applies to tracker layouts from older versions? | For tracker layouts created in earlier program versions up to 2024, the placement must be renewed to ensure that each tracker’s orientation is maintained relative to the graded terrain. (Helios 3D | HELP CENTER) |
| Why must older tracker placements be renewed before grading? | The article states that renewal is required so the orientation of each tracker is maintained relative to the graded terrain. (Helios 3D | HELP CENTER) |
| Where can I find more information about tracker rotation to the ground? | The article refers to the section Insertion/rotation of a tracker array to the surface for detailed information on how trackers are rotated to align with the ground. (Helios 3D | HELP CENTER) |
| How is the grading surface created for tracker arrays? | For trackers, the grading surface is created using two reference points at the beginning and end of the tracker, established during tracker insertion. A planar surface is then generated between the rows connecting these tracker reference points. (Helios 3D | HELP CENTER) |
| What are tracker grading reference points? | They are 3D coordinates located beneath the lowest module points at the start and end of the tracker. They help maintain consistent tracker placement on the graded terrain. (Helios 3D | HELP CENTER) |
| What do tracker grading reference points ensure? | They ensure that tracker placement on the graded terrain remains consistent with the original layout. (Helios 3D | HELP CENTER) |
| Can cut and fill distances be set individually for tracker arrays? | Yes. The article states that the distance for cut and fill can be set individually based on the module’s bottom edges. (Helios 3D | HELP CENTER) |
| What does the green grading surface represent in the tracker explanation? | The green grading surface represents the created grading surface generated from tracker reference points and the planar connection between rows. (Helios 3D | HELP CENTER) |
| What should I check if grading is not available for my rack type? | Check the array type. The article states that fixed-tilt arrays and trackers are supported from version 2024, while east-west racks are not included. (Helios 3D | HELP CENTER) |
| What should I check if the graded layout does not match the original placement? | Check whether the original PV layout was created without height adjustments, whether Insert Always was selected, and whether Adjust was left unchecked in the placement options. (Helios 3D | HELP CENTER) |
| What should I check if arrays were lifted before grading? | The grading workflow requires a layout without height adjustments for module-DTM clearance conflicts. If arrays were lifted or adjusted, recreate or renew the placement using Insert Always and with Adjust unchecked before grading. (Helios 3D | HELP CENTER) |
| What should I check if selected arrays cannot form one grading zone? | Check whether the arrays are directly adjacent. If they are farther apart, perform multiple grading operations sequentially. (Helios 3D | HELP CENTER) |
| What should I check if the grading zone behaves like separate islands? | This is expected when separate groups of arrays are selected or processed. Each group of arrays forms a separate grading zone, similar to islands, and is integrated with the original surface. (Helios 3D | HELP CENTER) |
| What should I check if cut or fill happens in the wrong direction? | Check Distance to DTM From, Ground Clearance, and the selected grading mode. Cut and fill distances can be measured from the module top or bottom edge, and areas closer than the specified distance are cut while farther areas are filled. (Helios 3D | HELP CENTER) |
| What should I check if the wrong module edge is used as reference? | Check Distance to DTM From. The selected top or bottom reference edge is shown in white in the preview. The actual edge values come from the array definition and cannot be modified in the grading dialog. (Helios 3D | HELP CENTER) |
| What should I check if I cannot change the edge values used for grading? | This is expected. The edge values are determined by the array definition properties and cannot be modified in the grading settings. (Helios 3D | HELP CENTER) |
| What should I check if only cutting should be performed? | Select Cut Only as the grading mode. This prevents fill operations from being performed in the same grading run. (Helios 3D | HELP CENTER) |
| What should I check if only filling should be performed? | Select Fill Only as the grading mode. This prevents cut operations from being performed in the same grading run. (Helios 3D | HELP CENTER) |
| What should I check if both lowering and raising terrain are needed? | Select Cut and Fill, because this mode performs both operations simultaneously. (Helios 3D | HELP CENTER) |
| What should I check if embankment transitions are too long? | Check Run Length of Embankment, because it limits the maximum embankment length and prevents overly long transitions when the angle is too shallow. (Helios 3D | HELP CENTER) |
| What should I check if the embankment starts directly at array edges? | Increase or review Distance to Begin Embankment, because this setting ensures that the embankment edge does not align directly with the array edges. (Helios 3D | HELP CENTER) |
| What should I check if I need a visual reference for embankment distances? | Use Show to display temporary polylines representing the set embankment distances. (Helios 3D | HELP CENTER) |
| What should I check if the generated grading surface is not visible in HELIOS 3D? | Check the placement list of the HELIOS 3D Palette and Autodesk Civil 3D Toolspace. The article states that the generated TIN surface is displayed in both locations. (Helios 3D | HELP CENTER) |
| What should I check if placements still use the original surface? | Check whether the graded surface was set as the HELIOS 3D surface using the To Helios3D surface command. Until then, the original surface may still be active for placement. (Helios 3D | HELP CENTER) |
| What should I check if the PV layout resets after using the graded surface? | This is expected behavior. The article states that setting the graded surface as the HELIOS 3D surface resets the existing PV layout. (Helios 3D | HELP CENTER) |
| What should I check if tracker orientation changes after grading? | For tracker layouts created in earlier program versions up to 2024, renew the placement so tracker orientation is maintained relative to the graded terrain. (Helios 3D | HELP CENTER) |
| What should I check if tracker grading does not follow the expected reference edge? | Check the tracker reference points and bottom-edge reference behavior. The article states that tracker grading uses reference points beneath the lowest module points at the start and end of the tracker, and cut/fill distance can be set individually based on module bottom edges. (Helios 3D | HELP CENTER) |
| Does the Grading Function automatically resolve clearance conflicts by lifting arrays? | No. The grading workflow is designed to avoid lifting arrays. It creates a graded surface beneath the selected arrays to achieve clearance while maintaining the original layout. (Helios 3D | HELP CENTER) |
| Does the Grading Function modify the original surface directly? | The article states that it creates a new graded surface and integrates grading zones with the original surface. It does not describe direct destructive editing of the original surface. (Helios 3D | HELP CENTER) |
| Does the Grading Function create a Civil 3D surface? | Yes. The generated surface is a standard TIN surface and is displayed in Autodesk Civil 3D Toolspace. (Helios 3D | HELP CENTER) |
| Does the Grading Function support multiple separated array groups in one operation? | Not as one continuous zone. Arrays must be directly adjacent for one grading operation. If they are farther apart, multiple grading operations must be performed sequentially. (Helios 3D | HELP CENTER) |
| Does the article describe earthwork volume calculation? | No. The article describes cut and fill surface generation, but it does not describe earthwork volume calculation or cut/fill volume reports. |
| Does the article describe exporting the graded surface? | No. The article states that the generated surface is a standard TIN surface shown in Civil 3D Toolspace and the HELIOS 3D Palette, but it does not describe export workflows. (Helios 3D | HELP CENTER) |
| Does the article describe how to delete a grading surface? | No. The article explains how to create and assign a graded surface, but it does not describe deleting it. |
| Does the article describe how to edit a grading surface after creation? | Not directly. It explains grading-zone settings before generating the surface, but it does not describe post-generation editing workflows. |
| Does the article describe grading for east-west racks? | No. It explicitly states that east-west racks are not included in the supported grading functionality. (Helios 3D | HELP CENTER) |
| How does Grading Function relate to Array Placement? | The grading workflow depends on an existing PV layout and specific placement settings. The placement should be created with the intended module-DTM distance, Insert Always enabled, and Adjust disabled so grading can modify the terrain instead of changing array heights. (Helios 3D | HELP CENTER) |
| How does Grading Function relate to Module-DTM clearance conflicts? | It is used when arrays have module-DTM clearance conflicts and the goal is to correct the terrain surface below the arrays rather than lifting or adjusting the arrays. (Helios 3D | HELP CENTER) |
| How does Grading Function relate to Civil 3D surfaces? | The grading function creates a standard TIN surface that appears in Civil 3D Toolspace and can be managed as a surface object. (Helios 3D | HELP CENTER) |
| How does Grading Function relate to the HELIOS 3D surface? | The generated graded surface can be set as the active HELIOS 3D surface using To Helios3D surface. After that, placements use the graded surface, and the original is shown as an alternative DTM. (Helios 3D | HELP CENTER) |
| How does Grading Function relate to trackers? | Trackers are supported from version 2024. For older tracker layouts up to 2024, placement must be renewed, and grading uses reference points beneath the lowest module points at the start and end of each tracker. (Helios 3D | HELP CENTER) |
| How does Grading Function relate to array definitions? | The top or bottom module-edge reference values used for cut and fill are determined by the array definition properties and cannot be changed in the grading dialog. (Helios 3D | HELP CENTER) |
| How does Grading Function relate to embankment design? | The grading function uses embankment settings to create smooth transitions between grading zones and the original surface, including fixed rise, adjustable run, angle, gradient, start distance, and maximum run length. (Helios 3D | HELP CENTER) |
| What is the main takeaway from the Grading Function article? | The Grading Function creates a new Civil 3D TIN surface below selected adjacent fixed-tilt or tracker arrays by cutting and/or filling terrain to meet module clearance requirements. It should be used after creating an unchanged placement with Insert Always enabled and Adjust disabled, and the resulting surface can then become the active HELIOS 3D surface. (Helios 3D | HELP CENTER) |
